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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2019	Aug. 01, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	Semler Scientific, Inc.
Entity Central Index Key	0001554859
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		6,499,976
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Current Reporting Status	Yes

Condensed Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues	$ 7,953	$ 5,484	$ 14,714	$ 9,947
Operating expenses:
Cost of revenues	885	680	1,781	1,384
Engineering and product development	591	489	1,160	856
Sales and marketing	2,212	1,779	4,281	3,484
General and administrative	1,570	1,001	2,943	1,875
Total operating expenses	5,258	3,949	10,165	7,599
Income from operations	2,695	1,535	4,549	2,348
Interest income (expense)	1	(9)	2	(56)
Related party interest expense		(72)		(131)
Other expense		(1)	(2)	(2)
Other income (expense)	1	(82)		(189)
Income before income taxes	2,696	1,453	4,549	2,159
Provision for taxes	77		77
Net income	$ 2,619	$ 1,453	$ 4,472	$ 2,159
Net income per share:
Basic (in dollars per share)	$ 0.41	$ 0.24	$ 0.70	$ 0.36
Diluted (in dollars per share)	$ 0.32	$ 0.19	$ 0.55	$ 0.29
Weighted average number of shares used in computing basic and diluted income per share:
Basic (in shares)	6,411,606	5,982,711	6,368,905	5,953,818
Diluted (in shares)	8,086,140	7,534,846	8,128,241	7,403,498

Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets:
Cash	$ 4,182	$ 3,284
Trade accounts receivable, net of allowance for doubtful accounts of $52 and $52, respectively	3,509	2,801
Prepaid expenses and other current assets	213	153
Total current assets	7,904	6,238
Assets for lease, net	1,690	1,243
Property and equipment, net	215	223
Long-term deposits	15	15
Total assets	9,824	7,719
Current liabilities:
Accounts payable	405	280
Accrued expenses	2,261	2,797
Deferred revenue	928	435
Total current liabilities	3,594	3,512
Long-term liabilities:
Deferred rent	9	11
Total long-term liabilities	9	11
Stockholders' equity:
Common stock, $0001 par value; 50,000,000 shares authorized; 6,484,414 and 6,349,985 shares issued, and 6,459,414 and 6,324,985 outstanding (treasury shares of 25,000 and 25,000), respectively	6	6
Additional paid-in capital	23,161	25,608
Accumulated deficit	(16,946)	(21,418)
Total stockholders' equity	6,221	4,196
Total liabilities and stockholders' equity	$ 9,824	$ 7,719

Condensed Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts on trade accounts receivable (in dollars)	$ 52	$ 52
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	6,484,414	6,349,985
Common stock, shares outstanding	6,459,414	6,324,985
Treasury stock, shares	25,000	25,000

Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Balance at Dec. 31, 2017	$ 6	$ 0	$ 23,843	$ (26,432)	$ (2,583)
Balance (in shares) at Dec. 31, 2017	5,902,244	(25,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Warrant Exercises			64		64
Warrant Exercises (in shares)	40,775
Stock Option Exercises			245		245
Stock Option Exercises (in shares)	105,378
Stock-based Compensation			331		331
Net income				2,159	2,159
Balance at Jun. 30, 2018	$ 6	$ 0	24,483	(24,273)	216
Balance (in shares) at Jun. 30, 2018	6,048,397	(25,000)
Balance at Mar. 31, 2018	$ 6	$ 0	24,196	(25,726)	(1,524)
Balance (in shares) at Mar. 31, 2018	5,969,834	(25,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Warrant Exercises (in shares)	7,800
Stock Option Exercises			149		149
Stock Option Exercises (in shares)	70,763
Stock-based Compensation			138		138
Net income				1,453	1,453
Balance at Jun. 30, 2018	$ 6	$ 0	24,483	(24,273)	216
Balance (in shares) at Jun. 30, 2018	6,048,397	(25,000)
Balance at Dec. 31, 2018	$ 6	$ 0	25,608	(21,418)	4,196
Balance (in shares) at Dec. 31, 2018	6,349,985	(25,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Warrant Re-purchase			(2,687)		(2,687)
Warrant Exercises (in shares)	22,527
Stock Option Exercises			44		$ 44
Stock Option Exercises (in shares)	111,902				117,765
Stock-based Compensation			196		$ 196
Net income				4,472	4,472
Balance at Jun. 30, 2019	$ 6	$ 0	23,161	(16,946)	6,221
Balance (in shares) at Jun. 30, 2019	6,484,414	(25,000)
Balance at Mar. 31, 2019	$ 6	$ 0	25,719	(19,565)	6,160
Balance (in shares) at Mar. 31, 2019	6,356,147	(25,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Warrant Re-purchase			(2,687)		(2,687)
Warrant Exercises (in shares)	22,527
Stock Option Exercises			31		31
Stock Option Exercises (in shares)	105,740
Stock-based Compensation			98		98
Net income				2,619	2,619
Balance at Jun. 30, 2019	$ 6	$ 0	$ 23,161	$ (16,946)	$ 6,221
Balance (in shares) at Jun. 30, 2019	6,484,414	(25,000)

Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 4,472	$ 2,159
Reconciliation of Net Income to Net Cash Provided by Operating Activities:
Amortization of debt discount		16
Accretion of non-cash interest		135
Depreciation	307	249
Loss on disposal of assets for lease	97	107
Bad debt expense	21	20
Stock-based compensation expense	196	331
Changes in Operating Assets and Liabilities:
Trade accounts receivable	(730)	(535)
Prepaid expenses and other current assets	(60)	(105)
Accounts payable	125	(303)
Accrued expenses	(538)	(570)
Deferred revenue	493	4
Net Cash Provided by Operating Activities	4,383	1,508
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property and equipment	(63)	(105)
Purchase of assets for lease, net	(779)	(138)
Net Cash Used in Investing Activities	(842)	(243)
CASH FLOWS FROM FINANCING ACTIVITIES:
Re-purchase of warrants	(2,687)
Exercise of warrants		64
Exercise of stock options	44	245
Payments of loans payable		(1,022)
Net Cash Used in Financing Activities	(2,643)	(713)
INCREASE IN CASH	898	552
CASH, BEGINNING OF PERIOD	3,284	1,457
CASH, END OF PERIOD	$ 4,182	2,009
Cash paid for interest		$ 191

Basis of Presentation

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation

1.	Basis of Presentation

Semler Scientific, Inc., a Delaware corporation (“Semler” or “the Company”), prepared the unaudited interim financial statements included in this report in accordance with United States generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the audited financial statements and notes thereto included in the Company’s annual report on Form 10-K for the year ended December 31, 2018 filed with the SEC on March 7, 2019 (the “Annual Report”). In the opinion of management, these financial statements include all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the financial position, results of operations and cash flows for the periods presented. The results of operations for the interim periods shown in this report are not necessarily indicative of the results that may be expected for any future period, including the full year.

Recently Issued Accounting Pronouncements

Accounting Pronouncements Recently Adopted

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (“ASU No. 2014-09”). The amendment in this ASU provides guidance on the revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The core principle of this update provides guidance to identify the performance obligations under the contract(s) with a customer and how to allocate the transaction price to the performance obligations in the contract. It further provides guidance to recognize revenue when (or as) the entity satisfies a performance obligation. This standard replaced most existing revenue recognition guidance. On August 8, 2015, the FASB issued ASU 2015-14, which deferred the effective date of ASU No. 2014-09 by one year, and permits early adoption as long as the adoption date is not before the original public entity effective date. Since the issuance of ASU 2014-09, the FASB has issued several amendments that clarify certain points, including ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), ASU 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing (“Topic 606”), ASU 2016-11, Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 Emerging Issues Task Force Meeting, and ASU 2016-12, Narrow-Scope Improvements and Practical Expedients, and ASU No. 2016-20, Technical Corrections and Improvements to Topic 606. The updated revenue standard allows two methods of adoption: (1) retrospectively to each prior period presented (“full retrospective method”), or (2) retrospectively with the cumulative effect recognized in retained earnings as of the date of adoption (“modified retrospective method”). The new standard further requires new disclosures about contracts with customers, including the significant judgments the company has made when applying the guidance. The Company adopted the new standard effective January 1, 2019, using the modified retrospective method. The Company determined that the adoption of this new standard did not have a material impact on its financial statements.

Topic 606 affects revenue recognition for the Company’s variable license fee contracts, which represents approximately $2,250 and $1,368 of revenues for the three month periods ended June 30, 2019 and 2018, respectively, and approximately $3,506 and $2,010 of revenues for the six month periods ended June 30, 2019 and 2018, respectively. Essentially all of the variable license fee contracts are with large healthcare organizations. The remainder of the revenue is earned from leasing the Company's testing product for a fixed monthly fee, which is not subject to Topic 606. It was determined that the impact of the new standard has no effect on the way revenue was currently being recognized. Reusable hardware equipment or accessories may be provided to a customer for a set price and then use of the associated software is billed to the customer monthly based on volume of use. Under this scenario, revenue is recognized when and only when the customer uses the product. The Company is rendering a service and recognizes revenue in direct proportion to how much service is rendered. The sale of the equipment or accessories is recognized as hardware sales upon shipment to the customer. The initial contract is for a specified time period with automatic renewal each period thereafter until canceled. In case there is a violation of any term of the contract, the Company may deactivate the service remotely, so that the customer cannot continue to use the product.

Accounting Pronouncements Not Yet Adopted

In January 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU No. 2016-02"). Under the new guidance in ASU No. 2016-02, lessees will be required to recognize the following for all leases (with the exception of short-term leases) at the commencement date: 1) A lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and 2) A right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged, however, certain targeted improvements were made. ASU No. 2016-02 also simplifies the accounting for sale and leaseback transactions. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Lessees and lessors may not apply a full retrospective transition approach. The new standard also requires expanded disclosures regarding leasing arrangements. In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements. This ASU provides another transition method in addition to the existing transition method by allowing entities to initially apply the new leases standard at the adoption date and recognize a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. This ASU also provides further guidance on lessors accounting policy election to not separate non-lease components from the associated lease components and limits this to circumstances in which the non-lease component or components otherwise would be accounted for under the new revenue guidance and both (1) the timing and pattern of transfer are the same for the non-lease component(s) and associated lease component, and (2) the lease component, if accounted for separately, would be classified as a an operating lease. In December 2018, the FASB issued ASU No. 2018-20, Leases (Topic 842): Narrow-Scope Improvements for Lessors. This ASU provide narrow scope improvements for lessor accounting by permitting lessors, as an accounting policy election, to treat certain sales taxes and other similar taxes as lessee costs, to exclude lessor costs paid by lessees directly to third parties from variable payments, and clarify the accounting by lessors for variable payments that related to both a lease component and a nonlease component. In January 2019, the FASB issued ASU No. 2019-01, Leases Codification Improvements, which reinstates the exception for lessors that are not manufacturers or dealers for determining fair value of the leased property as the underlying asset’s cost, clarifies the presentation on the statement of cash flows for sales type and direct financing leases for lessors that are depository and lending institutions and clarifies the transition disclosures related to accounting changes and error corrections in the year of adoption of the ASU. This update is effective for the Company’s annual periods beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently evaluating the impact that this new standard will have on its financial statements.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“Topic 326”). This ASU requires timelier recording of credit losses on loans and other financial instruments held. Instead of reserves based on a current probability analysis, Topic 326 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. All organizations will now use forward-looking information to better inform their credit loss estimates. Topic 326 requires enhanced disclosures regarding significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. These disclosures include qualitative and quantitative requirements that provide information about the amounts recorded in the financial statements. In addition, Topic 326 amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. In April 2019, the FASB issued ASU2019-04 Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments to introduce amendments which will affect the recognition and measurement of financial instruments, including derivatives and hedging. In May 2019, the FASB issued ASU 2019-05, Financial Instruments – Credit Losses (Topic 326); Targeted Transition Relief. The amendments in this ASU provide entities that have certain instruments within the scope of Subtopic 326-20 with an option to irrevocably elect the fair value option in Subtopic 825-10, applied on an instrument-by-instrument basis for eligible instruments upon adoption of Topic 326. This standard and related amendments are effective for the Company’s fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company will adopt the new standard in the first quarter of fiscal year 2020. The Company does not anticipate this new standard will have a material impact on its financial statements.

In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting (“ASU 2018-07”). This ASU expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. An entity should apply the requirements of Topic 718 to nonemployee awards except for specific guidance on inputs to an option pricing model and the attribution of costs. The ASU specifies that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. This standard is effective for the Company’s annual periods beginning after December 15, 2019, including interim periods within those fiscal years. The Company will adopt the new standard in the first quarter of fiscal year 2020. The Company does not anticipate this new standard will have a material impact on its financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this ASU modify the disclosure requirements on fair value measurements removing the requirements to disclosure amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, and the valuation processes for Level 3 fair value measurements. In addition, it modified certain disclosures related to Level 3 fair value measurements and added additional disclosures regarding the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period. This update is effective for the Company’s annual periods beginning after December 15, 2019, including interim periods within those fiscal years. The Company will adopt the new standard in the first quarter of fiscal year 2020. The Company does not anticipate this update to have a material impact on its financial statements.

Assets for Lease, net

6 Months Ended

Jun. 30, 2019

Leases, Capital [Abstract]

Assets for Lease, net

2.	Assets for Lease, net

Assets for lease consist of the following:

	June 30, 2019			December 31, 2018

Assets for lease	$	2,824		$	2,218
Less: accumulated depreciation		(1,134	)		(975	)
Assets for lease, net	$	1,690		$	1,243

Depreciation expense amounted to $126 and $101 for the three months ended June 30, 2019 and 2018, respectively. Depreciation expense amounted to $236 and $198 for the six months ended June 30, 2019 and 2018, respectively. Reduction to accumulated depreciation for returned items was $42 and $28 for the three months ended June 30, 2019 and 2018, respectively. Reduction to accumulated depreciation for returned items was $77 and $61 for the six months ended June 30, 2019 and 2018, respectively. The Company recognized a loss on disposal of assets for lease in the amount of $63 and $38 for the three months ended June 30, 2019 and 2018, respectively. The Company recognized a loss on disposal of assets for lease in the amount of $97 and $107 for the six months ended June 30, 2019 and 2018, respectively.

Property and Equipment, net

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment, net

Property and Equipment, net

Capital assets consist of the following:

	June 30, 2019			December 31, 2018

Capital assets	$	520		$	457
Less: accumulated depreciation		(305	)		(234	)
Capital assets, net	$	215		$	223

Depreciation expense amounted to $37 and $26 for the three months ended June 30, 2019 and 2018, respectively. Depreciation expense amounted to $71 and $51 for the six months ended June 30, 2019 and 2018, respectively.

Accrued Expenses

6 Months Ended

Jun. 30, 2019

Accrued Liabilities, Current [Abstract]

Accrued Expenses

4.	Accrued Expenses

Accrued expenses consist of the following:

	June 30, 2019		December 31, 2018

Compensation	$	1,838	$	2,442
Miscellaneous accruals		423		355
Total accrued expenses	$	2,261	$	2,797

Concentration of Credit Risk

6 Months Ended

Jun. 30, 2019

Risks and Uncertainties [Abstract]

Concentration of Credit Risk

Concentration of Credit Risk

Credit risk is the risk of loss from amounts owed by the financial counterparties. Credit risk can occur at multiple levels; as a result of broad economic conditions, challenges within specific sectors of the economy, or from issues affecting individual companies. Financial instruments that potentially subject the Company to credit risk consist of cash and accounts receivable.

The Company maintains cash with major financial institutions. The Company’s cash consists of bank deposits held with banks that, at times, exceed federally insured limits. The Company limits its credit risk by dealing with counterparties that are considered to be of high credit quality and by performing periodic evaluations of the relative credit standing of these financial institutions.

Management periodically monitors the creditworthiness of its customers and believes that it has adequately provided for any exposure to potential credit loss. For the three months ended June 30, 2018, two customers accounted for 50.3% and 22.5% of the Company’s revenue, respectively. For the six months ended June 30, 2018, two customers accounted for 53.9% and 17.7% of the Company’s revenue, respectively. For the three months ended June 30, 2019, three customers accounted for 50.8%, 14.8% and 13.8% of the Company’s revenue, respectively. For the six months ended June 30, 2019, three customers accounted for 53.0%, 13.2% and 11.1% of the Company’s revenue, respectively. As of December 31, 2018, two customers accounted for 43.5% and 40.4% of the Company’s accounts receivable, respectively. As of June 30, 2019, three customers accounted for 31.4%, 30.9% and 22.8% of the Company’s accounts receivable, respectively. The Company’s largest customer in terms of revenues for the three months ended June 30, 2019 and accounts receivable as of June 30, 2019 is a U.S. diversified healthcare company and its affiliated plans.

As of December 31, 2018, two vendors accounted for 11.0% and 10.8% of the Company’s accounts payable, respectively. As of June 30, 2019, three vendors accounted for 17.9%, 13.7%, and 10.6% of the Company’s accounts payable, respectively.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Facilities Leases

The Company recognized facilities lease expenses of $17 and $18 for the three months ended June 30, 2019 and 2018, respectively. The Company recognized facilities lease expenses of $34 and $35 for the six months ended June 30, 2019 and 2018, respectively.

Indemnification Obligations

The Company enters into agreements with customers, partners, lenders, consultants, lessors, contractors, sales representatives and parties to certain transactions in the ordinary course of the Company’s business. These agreements may require the Company to indemnify the other party against third party claims alleging that its product infringes a patent or copyright. Certain of these agreements require the Company to indemnify the other party against losses arising from: a breach of representations or covenants, claims relating to property damage, personal injury or acts or omissions of the Company, its employees, agents or representatives. The Company has also agreed to indemnify the directors and certain of the officers and employees in accordance with the by-laws of the Company. These indemnification provisions will vary based upon the nature and terms of the agreements. In many cases, these indemnification provisions do not contain limits on the Company’s liability, and the occurrence of contingent events that will trigger payment under these indemnities is difficult to predict. As a result, the Company cannot estimate its potential liability under these indemnities. The Company believes that the likelihood of conditions arising that would trigger these indemnities is remote and, historically, the Company had not made any significant payment under such indemnification provisions. Accordingly, the Company has not recorded any liabilities relating to these agreements. In certain cases, the Company has recourse against third parties with respect to the aforesaid indemnities, and the Company believes it maintains adequate levels of insurance coverage to protect the Company with respect to potential claims arising from such agreements.

Warrant Repurchase - Related Party

6 Months Ended

Jun. 30, 2019

Warrant Repurchase Related Party abstract

Warrant Repurchase - Related Party

7.	Warrant Repurchase – Related Party

On May 3, 2019, the Company entered into a Warrant Repurchase Agreement with the Murphy-Chutorian Family Trust U/D/T dated January 13, 1997, of which Douglas Murphy-Chutorian, M.D., the Company’s director and chief executive officer is co-Trustee with his spouse and of which he is a beneficiary. Pursuant to the warrant repurchase agreement, the Company repurchased a warrant to acquire 65,542 shares of the Company’s common stock held by the trust, which warrant had an exercise price equal to $4.50 per share and an expiration date of July 31, 2023, at an aggregate purchase price of $2,687. The purchase price reflects the difference between the aggregate exercise price of the warrant and the aggregate fair market value of the shares underlying the warrant, based on the last trade price of the Company’s common stock on May 3, 2019, the date of the warrant repurchase agreement. Following the warrant repurchase, the warrant was cancelled and is no longer issued and outstanding.

Stock Option Plan

6 Months Ended

Jun. 30, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Option Plan

8.	Stock Option Plan

The Company’s stock-based compensation program is designed to attract and retain employees while also aligning employees' interests with the interests of its stockholders. Stock options have been granted to employees under the stockholder-approved 2007 Key Person Stock Option Plan (“2007 Plan”) or the stockholder-approved 2014 Stock Incentive Plan (“2014 Plan”). Stockholder approval of the 2014 Plan became effective in September 2014. The 2014 Plan originally provided that the aggregate number of shares of common stock that may be issued pursuant to awards granted under the 2014 Plan may not exceed 450,000 shares (the “Share Reserve”), however in October 2015, the stockholders approved a 1,500,000 increase to the Share Reserve. In addition, the Share Reserve automatically increases on January 1st of each year, for a period of not more than 10 years, beginning on January 1st of the year following the year in which the 2014 Plan became effective and ending on (and including) January 1, 2024, in an amount equal to 4% of the total number of shares of common stock outstanding on December 31st of the preceding calendar year. The Company’s Board of Directors may act prior to January 1st of a given year to provide that there will be no January 1st increase in the Share Reserve for such year or that the increase in the Share Reserve for such year will be a lesser number of shares of common stock than would otherwise occur. On January 1, 2015, the Share Reserve increased by 188,640 shares due to the automatic 4% increase. On January 1, 2016, the Share Reserve increased by 204,943 shares due to the automatic 4% increase. On January 1, 2017, the Share Reserve increased by 204,943 shares due to the automatic 4% increase. On January 1, 2018, the Share Reserve increased by 235,090 shares due to the automatic 4% increase. The Share Reserve is currently 2,783,616 shares as of June 30, 2019.

In light of stockholder approval of the 2014 Plan, the Company no longer grants equity awards under the 2007 Plan. As of June 30, 2019, 0 shares of an aggregate total of 407,500 shares were available for future stock-based compensation grants under the 2007 Plan and 993,200 shares of an aggregate total of 2,783,616 shares were available for future stock-based compensation grants under the 2014 Plan.

Aggregate intrinsic value represents the difference between the closing market value as of June 30, 2019 of the underlying common stock and the exercise price of outstanding, in-the-money options. A summary of the Company’s stock option activity and related information for the six months ended June 30, 2019 is as follows:

	Options Outstanding
	Number of Stock Options Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (In Years)		Aggregate Intrinsic Value (in thousands)
Balance, January 1, 2019		1,761,447		$	3.18		6.84	$	55,000
Options exercised		(117,765	)		2.49
Balance, June 30, 2019		1,643,682		$	3.22		6.35	$	66,528
Exercisable as of June 30, 2019		1,478,808		$	3.04		6.18	$	60,129

The total compensation cost related to unvested stock option awards not yet recognized was $598 as of June 30, 2019. The weighted average period over which the total unrecognized compensation cost related to these unvested stock awards will be recognized is 1.38 years. The weighted average fair value of options granted during the six months ended June 30, 2018 was $5.97 per share, or an aggregate grant date fair value of $806. There were no options granted during the six months ended June 30, 2019.

On January 2, 2018, the Compensation Committee of the Company’s Board of Directors granted, and the full Board ratified, an option to acquire an aggregate of 125,000 shares under the 2014 Plan to the Company’s CEO. This option vests 25% on the one-year anniversary of the grant date and monthly thereafter for 36 months, such that the option is vested in full on the four-year anniversary of the grant date. On January 2, 2018, the Company’s Compensation Committee granted, and the full Board ratified, options to each of the then-seated non-employee Directors to acquire 5,000 shares, for an aggregate of 10,000 shares, under the 2014 Plan. These options vest on the one-year anniversary of their grant date. On February 28, 2018, the Compensation Committee of the Company’s Board of Directors accelerated the vesting on stock options issued to consultants such that all unvested shares were vested on that date. This resulted in a one-time expense of $49 during the three months ended March 31, 2018.

Determining the Fair Value of Stock Options

The Company uses the Black-Scholes pricing model to determine the fair value of stock options. The fair value of each option grant is estimated on the date of the grant. There were no stock options granted during the six months ended June 30, 2019. There were no stock options granted during the three months ended June 30, 2018. There were 135,000 stock options granted during the six months ended June 30, 2018. The following assumptions for the periods presented were:

	Three months ended June 30,						Six months ended June 30,
	2019			2018			2019			2018
Expected term (in years)		-			-			-			5
Risk-free interest rate		-	%		-	%		-	%		2.02	%
Expected volatility		-	%		-	%		-	%		0.99	%
Expected dividend rate		-	%		-	%		-	%		-	%

The assumptions are based on the following for each of the periods presented:

Valuation Method — The Company estimates the fair value of its stock options using the Black-Scholes option pricing model.

Expected Term — The Company estimates the expected term consistent with the simplified method identified by the SEC. The Company elected to use the simplified method because of its limited history of stock option exercise activity and its stock options meet the criteria of the “plain-vanilla” options as defined by the SEC. The simplified method calculates the expected term as the average of the vesting and contractual terms of the award.

Volatility — The Company derives this number from the historical stock volatilities of the Company’s stock over a period approximately equal to the expected term of the options.

Risk-free Interest Rate — The risk-free interest rate is based on median U.S. Treasury zero coupon issues with remaining terms similar to the expected term on the options.

Expected Dividend — The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and therefore, used an expected dividend yield of zero in the valuation model.

Forfeiture — Beginning in the first quarter of 2017, the Company implemented ASU 2016-09, and elected to true-up calculations at the time of forfeiture, rather than creating an estimate at the time of option issuance.

The Company has recorded an expense of $97 and $138 as it relates to stock-based compensation for the three months ended June 30, 2019 and 2018, respectively. The Company has recorded an expense of $196 and $331 as it relates to stock-based compensation for the six months ended June 30, 2019 and 2018, respectively:

	Three months ended June 30,				Six months ended June 30
	2019		2018		2019		2018
Cost of Revenue	$	1	$	1	$	1	$	1
Engineering and Product Development		5		9		12		17
Sales and Marketing		15		22		31		51
General and Administrative		77		106		152		262
Total	$	98	$	138	$	196	$	331

Net Income Per Share, Basic and Diluted

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Net Income Per Share, Basic and Diluted

9.	Net Income Per Share, Basic and Diluted

Basic earnings per share (“EPS”) represent net income attributable to common stockholders divided by the weighted average number of common shares outstanding during the measurement period. Diluted EPS represents net income attributable to common stockholders divided by the weighted average number of common shares outstanding during the measurement period while also giving effect to all potentially dilutive common shares that were outstanding during the period using the treasury stock method.

Basic and diluted net EPS is calculated as follows:

	Three months ended June 30,
	2019						2018
	Shares		Net Income		EPS		Shares		Net Income		EPS
Basic EPS		6,411,606	$	2,619	$	0.41		5,982,711	$	1,453	$	0.24
Common stock warrants		168,099		-				281,224		-
Common stock options		1,506,435		-				1,270,911		-
Diluted EPS		8,086,140	$	2,619	$	0.32		7,534,846	$	1,453	$	0.19

	Six months ended June 30,
	2019						2018
	Shares		Net Income		EPS		Shares		Net Income		EPS
Basic EPS		6,368,905	$	4,472	$	0.70		5,953,818	$	2,159	$	0.36
Common stock warrants		207,471		-				256,916		-
Common stock options		1,551,865		-				1,195,010		-
Diluted EPS		8,128,241	$	4,472	$	0.55		7,403,498	$	2,159	$	0.29

The following weighted average shares outstanding of common stock equivalents were excluded from the computation of diluted net income per share for the three and six months ended June 30, 2019 and 2018 because including them would have been anti-dilutive:

	Three months ended June 30,				Six months ended June 30,
	2019		2018		2019		2018
Weighted average shares outstanding:
Common stock warrants		-		-		-		-
Options		-		135,000		-		135,000
Total		-		135,000		-		135,000

Summary of Significant Accounting Policies and Estimates (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Semler Scientific, Inc., a Delaware corporation ("Semler" or "the Company"), prepared the unaudited interim financial statements included in this report in accordance with United States generally accepted accounting principles ("GAAP") and applicable rules and regulations of the Securities and Exchange Commission ("SEC") for interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the audited financial statements and notes thereto included in the Company's annual report on Form 10-K for the year ended December 31, 2018 filed with the SEC on March 7, 2019 (the "Annual Report"). In the opinion of management, these financial statements include all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the financial position, results of operations and cash flows for the periods presented. The results of operations for the interim periods shown in this report are not necessarily indicative of the results that may be expected for any future period, including the full year.
Recently Issued Accounting Pronouncements	Accounting Pronouncements Recently Adopted In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (“ASU No. 2014-09”). The amendment in this ASU provides guidance on the revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The core principle of this update provides guidance to identify the performance obligations under the contract(s) with a customer and how to allocate the transaction price to the performance obligations in the contract. It further provides guidance to recognize revenue when (or as) the entity satisfies a performance obligation. This standard replaced most existing revenue recognition guidance. On August 8, 2015, the FASB issued ASU 2015-14, which deferred the effective date of ASU No. 2014-09 by one year, and permits early adoption as long as the adoption date is not before the original public entity effective date. Since the issuance of ASU 2014-09, the FASB has issued several amendments that clarify certain points, including ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), ASU 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing (“Topic 606”), ASU 2016-11, Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 Emerging Issues Task Force Meeting, and ASU 2016-12, Narrow-Scope Improvements and Practical Expedients, and ASU No. 2016-20, Technical Corrections and Improvements to Topic 606. The updated revenue standard allows two methods of adoption: (1) retrospectively to each prior period presented (“full retrospective method”), or (2) retrospectively with the cumulative effect recognized in retained earnings as of the date of adoption (“modified retrospective method”). The new standard further requires new disclosures about contracts with customers, including the significant judgments the company has made when applying the guidance. The Company adopted the new standard effective January 1, 2019, using the modified retrospective method. The Company determined that the adoption of this new standard did not have a material impact on its financial statements. Topic 606 affects revenue recognition for the Company’s variable license fee contracts, which represents approximately $2,250 and $1,368 of revenues for the three month periods ended June 30, 2019 and 2018, respectively, and approximately $3,506 and $2,010 of revenues for the six month periods ended June 30, 2019 and 2018, respectively. Essentially all of the variable license fee contracts are with large healthcare organizations. The remainder of the revenue is earned from leasing the Company's testing product for a fixed monthly fee, which is not subject to Topic 606. It was determined that the impact of the new standard has no effect on the way revenue was currently being recognized. Reusable hardware equipment or accessories may be provided to a customer for a set price and then use of the associated software is billed to the customer monthly based on volume of use. Under this scenario, revenue is recognized when and only when the customer uses the product. The Company is rendering a service and recognizes revenue in direct proportion to how much service is rendered. The sale of the equipment or accessories is recognized as hardware sales upon shipment to the customer. The initial contract is for a specified time period with automatic renewal each period thereafter until canceled. In case there is a violation of any term of the contract, the Company may deactivate the service remotely, so that the customer cannot continue to use the product. Accounting Pronouncements Not Yet Adopted In January 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU No. 2016-02"). Under the new guidance in ASU No. 2016-02, lessees will be required to recognize the following for all leases (with the exception of short-term leases) at the commencement date: 1) A lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and 2) A right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged, however, certain targeted improvements were made. ASU No. 2016-02 also simplifies the accounting for sale and leaseback transactions. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Lessees and lessors may not apply a full retrospective transition approach. The new standard also requires expanded disclosures regarding leasing arrangements. In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements. This ASU provides another transition method in addition to the existing transition method by allowing entities to initially apply the new leases standard at the adoption date and recognize a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. This ASU also provides further guidance on lessors accounting policy election to not separate non-lease components from the associated lease components and limits this to circumstances in which the non-lease component or components otherwise would be accounted for under the new revenue guidance and both (1) the timing and pattern of transfer are the same for the non-lease component(s) and associated lease component, and (2) the lease component, if accounted for separately, would be classified as a an operating lease. In December 2018, the FASB issued ASU No. 2018-20, Leases (Topic 842): Narrow-Scope Improvements for Lessors. This ASU provide narrow scope improvements for lessor accounting by permitting lessors, as an accounting policy election, to treat certain sales taxes and other similar taxes as lessee costs, to exclude lessor costs paid by lessees directly to third parties from variable payments, and clarify the accounting by lessors for variable payments that related to both a lease component and a nonlease component. In January 2019, the FASB issued ASU No. 2019-01, Leases Codification Improvements, which reinstates the exception for lessors that are not manufacturers or dealers for determining fair value of the leased property as the underlying asset’s cost, clarifies the presentation on the statement of cash flows for sales type and direct financing leases for lessors that are depository and lending institutions and clarifies the transition disclosures related to accounting changes and error corrections in the year of adoption of the ASU. This update is effective for the Company’s annual periods beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently evaluating the impact that this new standard will have on its financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“Topic 326”). This ASU requires timelier recording of credit losses on loans and other financial instruments held. Instead of reserves based on a current probability analysis, Topic 326 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. All organizations will now use forward-looking information to better inform their credit loss estimates. Topic 326 requires enhanced disclosures regarding significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. These disclosures include qualitative and quantitative requirements that provide information about the amounts recorded in the financial statements. In addition, Topic 326 amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. In April 2019, the FASB issued ASU2019-04 Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments to introduce amendments which will affect the recognition and measurement of financial instruments, including derivatives and hedging. In May 2019, the FASB issued ASU 2019-05, Financial Instruments – Credit Losses (Topic 326); Targeted Transition Relief. The amendments in this ASU provide entities that have certain instruments within the scope of Subtopic 326-20 with an option to irrevocably elect the fair value option in Subtopic 825-10, applied on an instrument-by-instrument basis for eligible instruments upon adoption of Topic 326. This standard and related amendments are effective for the Company’s fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company will adopt the new standard in the first quarter of fiscal year 2020. The Company does not anticipate this new standard will have a material impact on its financial statements. In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting (“ASU 2018-07”). This ASU expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. An entity should apply the requirements of Topic 718 to nonemployee awards except for specific guidance on inputs to an option pricing model and the attribution of costs. The ASU specifies that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. This standard is effective for the Company’s annual periods beginning after December 15, 2019, including interim periods within those fiscal years. The Company will adopt the new standard in the first quarter of fiscal year 2020. The Company does not anticipate this new standard will have a material impact on its financial statements. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this ASU modify the disclosure requirements on fair value measurements removing the requirements to disclosure amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, and the valuation processes for Level 3 fair value measurements. In addition, it modified certain disclosures related to Level 3 fair value measurements and added additional disclosures regarding the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period. This update is effective for the Company’s annual periods beginning after December 15, 2019, including interim periods within those fiscal years. The Company will adopt the new standard in the first quarter of fiscal year 2020. The Company does not anticipate this update to have a material impact on its financial statements.

Assets for Lease, net (Tables)

6 Months Ended

Jun. 30, 2019

Leases, Capital [Abstract]

Schedule of assets for lease

	June 30, 2019			December 31, 2018

Assets for lease	$	2,824		$	2,218
Less: accumulated depreciation		(1,134	)		(975	)
Assets for lease, net	$	1,690		$	1,243

Property and Equipment, net (Tables)

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment [Abstract]

Schedule of property and equipment, net

	June 30, 2019			December 31, 2018

Capital assets	$	520		$	457
Less: accumulated depreciation		(305	)		(234	)
Capital assets, net	$	215		$	223

Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2019

Accrued Liabilities, Current [Abstract]

Schedule of accrued expenses

	June 30, 2019		December 31, 2018

Compensation	$	1,838	$	2,442
Miscellaneous accruals		423		355
Total accrued expenses	$	2,261	$	2,797

Stock Option Plan (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock option activity

	Options Outstanding
		Number of Stock Options Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (In Years)		Aggregate Intrinsic Value (in thousands)
Balance, January 1, 2019			1,761,447		$	3.18		6.84	$	55,000
Options exercised			( 117,765	)		2.49
Balance, June 30, 2019			1,643,682		$	3.22		6.35	$	66,528
Exercisable as of June 30, 2019			1,478,808		$	3.04		6.18	$	60,129

Schedule of weighted-average Black-Scholes fair value assumptions

	Three months ended June 30,				Six months ended June 30,
	2019		2018		2019		2018
Expected term (in years)								5
Risk-free interest rate		%		%		%		2.02	%
Expected volatility		%		%		%		0.99	%
Expected dividend rate		%		%		%			%

Schedule of stock-based compensation

	Three months ended June 30,				Six months ended June 30
	2019		2018		2019		2018
Cost of Revenue	$	1	$	1	$	1	$	1
Engineering and Product Development		5		9		12		17
Sales and Marketing		15		22		31		51
General and Administrative		77		106		152		262
Total	$	98	$	138	$	196	$	331

Net Income Per Share, Basic and Diluted (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of basic and diluted net EPS

	Three months ended June 30,
	2019						2018
	Shares		Net Income		EPS		Shares		Net Income		EPS
Basic EPS		6,411,606	$	2,619	$	0.41		5,982,711	$	1,453	$	0.24
Common stock warrants		168,099		-				281,224		-
Common stock options		1,506,435		-				1,270,911		-
Diluted EPS		8,086,140	$	2,619	$	0.32		7,534,846	$	1,453	$	0.19

	Six months ended June 30,
	2019						2018
	Shares		Net Income		EPS		Shares		Net Income		EPS
Basic EPS		6,368,905	$	4,472	$	0.70		5,953,818	$	2,159	$	0.36
Common stock warrants		207,471		-				256,916		-
Common stock options		1,551,865		-				1,195,010		-
Diluted EPS		8,128,241	$	4,472	$	0.55		7,403,498	$	2,159	$	0.29

Schedule of weighted average shares outstanding excluded from the computation of diluted net loss per share

	Three months ended June 30,				Six months ended June 30,
	2019		2018		2019		2018
Weighted average shares outstanding:
Common stock warrants		-		-		-		-
Options		-		135,000		-		135,000
Total		-		135,000		-		135,000

Basis of Presentation (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Revenue recognition under variable license fee contracts	$ 2,250	$ 1,368	$ 3,506	$ 2,010

Assets for Lease, net - Summary of assets for lease (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Leases, Capital [Abstract]
Assets for lease	$ 2,824	$ 2,218
Less: accumulated depreciation	(1,134)	(975)
Assets for lease, net	$ 1,690	$ 1,243

Assets for Lease, net (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases, Capital [Abstract]
Depreciation expense	$ 126	$ 101	$ 236	$ 198
Reduction to accumulated depreciation for returned items	42	28	77	61
Loss on disposal of assets for lease	$ (63)	$ (38)	$ (97)	$ (107)

Property and Equipment, net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Capital assets	$ 520	$ 457
Less: accumulated depreciation	(305)	(234)
Capital assets, net	$ 215	$ 223

Property and Equipment, net (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 37	$ 26	$ 71	$ 51

Accrued Expenses - Summary of accrued expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accrued Liabilities, Current [Abstract]
Compensation	$ 1,838	$ 2,442
Miscellaneous accruals	423	355
Total accrued expenses	$ 2,261	$ 2,797

Concentration of Credit Risk (Detail Textuals)	3 Months Ended		6 Months Ended		12 Months Ended
Concentration of Credit Risk (Detail Textuals)	Jun. 30, 2019 Customer	Jun. 30, 2018 Customer	Jun. 30, 2019 Customer	Jun. 30, 2018 Customer	Dec. 31, 2018 Customer Vendor
Customer concentration risk \| Revenue
Concentration Risk [Line Items]
Number of customers	3	2	3	2
Customer concentration risk \| Revenue \| Customer one
Concentration Risk [Line Items]
Concentration risk percentage	50.80%	50.30%	53.00%	53.90%
Customer concentration risk \| Revenue \| Customer two
Concentration Risk [Line Items]
Concentration risk percentage	14.80%	22.50%	13.20%	17.70%
Customer concentration risk \| Revenue \| Customer three
Concentration Risk [Line Items]
Concentration risk percentage	13.80%		11.10%
Customer concentration risk \| Accounts receivable
Concentration Risk [Line Items]
Number of customers			3		2
Customer concentration risk \| Accounts receivable \| Customer one
Concentration Risk [Line Items]
Concentration risk percentage			31.40%		43.50%
Customer concentration risk \| Accounts receivable \| Customer two
Concentration Risk [Line Items]
Concentration risk percentage			30.90%		40.40%
Customer concentration risk \| Accounts receivable \| Customer three
Concentration Risk [Line Items]
Concentration risk percentage			22.80%
Vendor concentration risk \| Accounts payable
Concentration Risk [Line Items]
Number of customers			3		2
Vendor concentration risk \| Accounts payable \| Vendor one
Concentration Risk [Line Items]
Concentration risk percentage			17.90%		11.00%
Vendor concentration risk \| Accounts payable \| Vendor two
Concentration Risk [Line Items]
Concentration risk percentage			13.70%		10.80%
Vendor concentration risk \| Accounts payable \| Vendor three
Concentration Risk [Line Items]
Concentration risk percentage			10.60%

Commitments and Contingencies (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Loans Payable [Abstract]
Facilities lease expenses	$ 17	$ 18	$ 34	$ 35

Warrant Repurchase - Related Party (Detail Textuals) - Warrant Repurchase Agreement - Murphy Chutorian Family Trust $ / shares in Units, $ in Thousands	May 03, 2019 USD ($) $ / shares shares
Class of Warrant or Right [Line Items]
Repurchase of warrant to acquire shares \| shares	65,542
Warrant exercise price \| $ / shares	$ 4.50
Warrant expiration date	Jul. 31, 2023
Warrant aggregate purchase price \| $	$ 2,687

Stock Option Plan - Summary of stock-based compensation activity (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Number of Stock Options Outstanding
Balance, Beginning \| shares	1,761,447
Options exercised \| shares	(117,765)
Balance, Ending \| shares	1,643,682	1,761,447
Exercisable, Ending \| shares	1,478,808
Weighted Average Exercise Price
Balance, Beginning \| $ / shares	$ 3.18
Options exercised \| $ / shares	2.49
Balance, Ending \| $ / shares	3.22	$ 3.18
Exercisable, Ending \| $ / shares	$ 3.04
Weighted Average Remaining Contractual Term, Options Outstanding (in years)	6 years 4 months 6 days	6 years 10 months 2 days
Weighted Average Remaining Contractual Term, Options Exercisable (in years)	6 years 2 months 4 days
Aggregate Intrinsic Value, Options Outstanding \| $	$ 66,528	$ 55,000
Aggregate Intrinsic Value, Options Exercisable \| $	$ 60,129

Stock Option Plan - Weighted-average Black-Scholes fair value assumptions (Details 1)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected term (in years)				5 years
Risk free interest rate	0.00%	0.00%	0.00%	2.02%
Expected volatility	0.00%	0.00%	0.00%	0.99%
Expected dividend rate	0.00%	0.00%	0.00%	0.00%

Stock Option Plan - Stock-based compensation (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 98	$ 138	$ 196	$ 331
Cost of Revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1	1	1	1
Engineering and Product Development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	5	9	12	17
Sales and Marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	15	22	31	51
General and Administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 77	$ 106	$ 152	$ 262

Stock Option Plan (Detail Textuals) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended					3 Months Ended			6 Months Ended
	Jan. 02, 2018	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016	Oct. 31, 2015	Jan. 31, 2015	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested stock options							$ 598			$ 598
Weighted average period of unvested stock awards										1 year 4 months 17 days
Weighted average grant date fair value of options granted											$ 5.97
Aggregate grant date fair value											$ 806
One-time expense									$ 49
Stock-based compensation expense							$ 98	$ 138		$ 196	$ 331
Number of stock option granted											135,000
2007 Key Person Stock Option Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future stock-based compensation grants							0			0
Maximum number of shares issued pursuant to awards granted under plan							407,500			407,500
2014 Stock Incentive Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future stock-based compensation grants							993,200			993,200
Maximum number of shares issued pursuant to awards granted under plan							2,783,616			2,783,616		450,000
Maximum term of stock option grants					10 years
Number of share reserve increased		235,090	204,943	204,943	1,500,000	188,640
Percentage of shares reserve increased		4.00%	4.00%	4.00%	4.00%	4.00%
2014 Stock Incentive Plan \| Stock options \| CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future stock-based compensation grants	125,000
Percentage of shares vested on one year anniversary	25.00%
Number of years in options fully vested	four - year
2014 Stock Incentive Plan \| Stock options \| Non Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future stock-based compensation grants	5,000
Maximum number of shares issued pursuant to awards granted under plan	10,000
Number of years in options fully vested	one-year

Net Income Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Basic EPS (in shares)	6,411,606	5,982,711	6,368,905	5,953,818
Common stock warrants (in shares)	168,099	281,224	207,471	256,916
Common stock options (in shares)	1,506,435	1,270,911	1,551,865	1,195,010
Diluted EPS (in shares)	8,086,140	7,534,846	8,128,241	7,403,498
Net Income - Basic EPS	$ 2,619	$ 1,453	$ 4,472	$ 2,159
Net Income - Common stock warrants	0	0	0	0
Net Income - Common stock options	0	0	0	0
Net Income - Diluted EPS	$ 2,619	$ 1,453	$ 4,472	$ 2,159
Basic EPS (in dollars per share)	$ 0.41	$ 0.24	$ 0.70	$ 0.36
Diluted EPS (in dollars per share)	$ 0.32	$ 0.19	$ 0.55	$ 0.29

Net Income Per Share, Basic and Diluted (Details 1) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Weighted average shares outstanding:
Total	0	135,000	0	135,000
Common stock warrants
Weighted average shares outstanding:
Total	0	0	0	0
Options
Weighted average shares outstanding:
Total	0	135,000	0	135,000