WiSA (WISA) 10-Q 14 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 14, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Registrant Name	Summit Wireless Technologies, Inc.
Entity Central Index Key	0001682149
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Trading Symbol	WISA
Entity Common Stock, Shares Outstanding		19,812,431
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Small Business	true
Entity Current Reporting Status	Yes
Entity Shell Company	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	[1]
Current Assets:
Cash and cash equivalents	$ 3,322	$ 3,218
Accounts receivable	18	112
Inventories	2,082	1,383
Prepaid expenses and other current assets	490	428
Total current assets	5,912	5,141
Property and equipment, net	107	110
Intangible assets, net	44	61
Other assets	94	94
Total assets	6,157	5,406
Current Liabilities:
Accounts payable	1,018	532
Accrued liabilities	760	846
Total current liabilities	1,778	1,378
Derivative liability	387	0
Warrant liability	39	210
Total liabilities	2,204	1,588
Commitments and contingencies (Note 9)
Series A 8% Senior Convertible Preferred stock, par value $0.0001; 1,250,000 shares authorized; 250,000 and zero shares issued and outstanding as of June 30, 2019 and December 31, 2018 (liquidation preference of $1,016,000 and $0 as of June 30, 2019 and December 31, 2018)	477	0
Stockholders' Equity:
Common stock, par value $0.0001; 200,000,000 shares authorized; 19,727,431 and 15,366,327 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	2	2
Additional paid-in capital	184,561	179,501
Accumulated other comprehensive loss	(58)	(45)
Accumulated deficit	(181,029)	(175,640)
Total stockholders' equity	3,476	3,818
Total liabilities, preferred stock and stockholders' equity	$ 6,157	$ 5,406
[1]	The condensed consolidated balance sheet as of December 31, 2018 was derived from the audited consolidated balance sheet as of that date.

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
CONDENSED CONSOLIDATED BALANCE SHEETS
Temporary Equity, Dividend Rate, Percentage	8.00%	8.00%
Temporary Equity, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Temporary Equity, Shares Authorized	1,250,000	1,250,000
Temporary Equity, Shares Issued	250,000	0
Temporary Equity, Shares Outstanding	250,000	0
Temporary Equity, Liquidation Preference	$ 1,016,000	$ 0
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Shares, Issued	19,727,431	15,366,327
Common Stock, Shares, Outstanding	19,727,431	15,366,327

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue, net	$ 352	$ 380	$ 817	$ 662
Cost of revenue	330	433	737	831
Gross profit	22	(53)	80	(169)
Operating Expenses:
Research and development	1,405	993	2,766	2,598
Sales and marketing	676	469	1,425	1,381
General and administrative	657	418	1,272	1,649
Total operating expenses	2,738	1,880	5,463	5,628
Loss from operations	(2,716)	(1,933)	(5,383)	(5,797)
Interest expense	0	(10,593)	0	(19,331)
Change in fair value of warrant liability	64	(4,358)	175	(4,249)
Change in fair value of derivative liability	(171)	(2,572)	(171)	(3,386)
Other income (expense), net	0	(1)	(3)	0
Loss before provision for income taxes	(2,823)	(19,457)	(5,382)	(32,763)
Provision for income taxes	1	0	7	2
Net loss	(2,824)	(19,457)	(5,389)	(32,765)
Preferred stock dividend	(16)	0	(16)	0
Net loss attributable to common stockholders	$ (2,840)	$ (19,457)	$ (5,405)	$ (32,765)
Net loss per common share - basic and diluted	$ (0.16)	$ (59.84)	$ (0.33)	$ (100.80)
Weighted average number of common shares used in computing net loss per common share	17,226,739	325,148	16,317,174	325,041

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net loss	$ (2,824)	$ (19,457)	$ (5,389)	$ (32,765)
Other comprehensive loss, net of tax:
Foreign currency translation adjustment	(2)	0	(13)	(1)
Comprehensive loss	$ (2,826)	$ (19,457)	$ (5,402)	$ (32,766)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Preferred Stock [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2017	$ 64,735	$ 0	$ 13,832	$ (42)	$ (108,283)	$ (94,493)
Balance (in shares) at Dec. 31, 2017	2,762,594	324,821
Issuance of common shares to note holder upon extension of maturity date	$ 0	$ 0	0	0	0	0
Issuance of common shares to note holder upon extension of maturity date (in shares)	0	327
Beneficial conversion feature upon issuance of convertible notes	$ 0	$ 0	255	0	0	255
Issuance of warrants for common shares	$ 0	$ 0	277	0	0	277
Issuance of warrants for common shares (in shares)	0	0
Reclassification of warrants	$ 0	$ 0	192	0	0	192
Stock compensation expense	0	0	2,156	0	0	2,156
Currency translation adjustment	0	0	0	(1)	0	(1)
Net loss	0	0	0	0	(13,308)	(13,308)
Balance at Mar. 31, 2018	$ 64,735	$ 0	16,712	(43)	(121,591)	(104,922)
Balance (in shares) at Mar. 31, 2018	2,762,594	325,148
Beneficial conversion feature upon issuance of convertible notes	$ 0	$ 0	410	0	0	410
Issuance of warrants for common shares	$ 0	$ 0	518	0	0	518
Issuance of warrants for common shares (in shares)	0	0
Currency translation adjustment	$ 0	$ 0	0	0	0	0
Net loss	0	0	0	0	(19,457)	(19,457)
Balance at Jun. 30, 2018	$ 64,735	$ 0	17,640	(43)	(141,048)	(123,451)
Balance (in shares) at Jun. 30, 2018	2,762,594	325,148
Balance at Dec. 31, 2018	$ 0	$ 2	179,501	(45)	(175,640)	3,818	[1]
Balance (in shares) at Dec. 31, 2018	0	15,366,327
Release of vested restricted common stock	$ 0	$ 0	(65)	0	0	(65)
Release of vested restricted common stock (in shares)	0	123,848
Issuance of warrants for common stock	$ 0	$ 0	0	0	0	0
Issuance of warrants for common stock (in shares)	0	0
Currency translation adjustment	$ 0	$ 0	0	(11)	0	(11)
Net loss	0	0	0	0	(2,565)	(2,565)
Balance at Mar. 31, 2019	$ 0	$ 2	179,436	(56)	(178,205)	1,177
Balance (in shares) at Mar. 31, 2019	0	15,490,175
Balance at Dec. 31, 2018	$ 0	$ 2	179,501	(45)	(175,640)	3,818	[1]
Balance (in shares) at Dec. 31, 2018	0	15,366,327
Balance at Jun. 30, 2019	$ 477	$ 2	184,561	(58)	(181,029)	3,476
Balance (in shares) at Jun. 30, 2019	250,000	19,727,431
Balance at Mar. 31, 2019	$ 0	$ 2	179,436	(56)	(178,205)	1,177
Balance (in shares) at Mar. 31, 2019	0	15,490,175
Proceeds from issuance of preferred stock and common stock warrant, net of issuance costs	$ 720	$ 0	200	0	0	200
Proceeds from issuance of preferred stock and common stock warrant, net of issuance costs (in shares)	250,000	0
Fair value of derivative liability in connection with issuance of preferred stock	$ (216)	$ 0	0	0	0	0
Issuance of warrants for common stock, in connection with preferred stock offering	$ (43)	$ 0	43	0	0	43
Issuance of warrants for common stock, in connection with preferred stock offering (in shares)	0	0
Accretion of preferred stock dividend	$ 16	$ 0	(16)	0	0	(16)
Proceeds from issuance of common stock, net of issuance costs	$ 0	$ 0	4,664	0	0	4,664
Proceeds from issuance of common stock, net of issuance costs (shares)	0	4,075,726
Issuance of common stock for vendor services	$ 0	$ 0	234	0	0	234
Issuance of common stock for vendor services (shares)	0	161,530
Currency translation adjustment	$ 0	$ 0	0	(2)	0	(2)
Net loss	0	0	0	0	(2,824)	(2,824)
Balance at Jun. 30, 2019	$ 477	$ 2	$ 184,561	$ (58)	$ (181,029)	$ 3,476
Balance (in shares) at Jun. 30, 2019	250,000	19,727,431
[1]	The condensed consolidated balance sheet as of December 31, 2018 was derived from the audited consolidated balance sheet as of that date.

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net loss	$ (5,389)	$ (32,765)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	28	19
Stock-based compensation	0	2,156
Amortization of intangible asset	17	17
Amortization of debt discounts	0	14,191
Change in fair value of warrant liability	(175)	4,249
Change in fair value of derivative liability	171	3,386
Expense for issuance of consultant warrants and common stock	238	65
Changes in operating assets and liabilities:
Accounts receivable	94	48
Inventories	(699)	(123)
Prepaid expenses and other assets	(62)	(407)
Accounts payable	486	743
Accrued liabilities	(86)	60
Accrued interest	0	5,137
Net cash used in operating activities	(5,377)	(3,224)
Cash flows from investing activities:
Purchases of property and equipment	(25)	(36)
Net cash used in investing activities	(25)	(36)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs	4,664	0
Proceeds from the issuance of preferred stock and common stock warrant, net of issuance costs	920	0
Proceeds from issuance of promissory notes, net of issuance costs	0	2,002
Proceeds from issuance of convertible notes payable, net of issuance costs	0	1,435
Taxes paid related to net share settlements of equity awards	(65)	0
Net cash provided by financing activities	5,519	3,437
Effect of exchange rate changes on cash and cash equivalents	(13)	(1)
Net decrease in cash and cash equivalents	104	176
Cash and cash equivalents as of beginning of year	3,218	249
Cash and cash equivalents as of end of year	3,322	425
Supplemental disclosure of cash flow information:
Cash paid for income taxes	7	2
Noncash Investing and Financing Activities:
Issuance of warrants in connection with convertible notes payable	0	795
Issuance of common stock warrants in connection with preferred stock offering	243	0
Issuance of warrants in connection in public offering	70	0
Beneficial conversion feature of convertible notes payable	0	665
Fair value of derivative liability in connection with issuance of preferred stock	216	0
Accretion of preferred stock dividend	16	0
Issuance of convertible notes in lieu of employee expense payments	0	50
Conversion of accrued interest to accounts payable	0	2
Conversion of interest to convertible notes payable as principal	0	9
Fair value of derivative liability in connection with issuance of notes payable	0	1,558
Reclassification of warrant liability to stockholders' equity	$ 0	$ 192

Business and Viability of Opera

Business and Viability of Operations	6 Months Ended
	Jun. 30, 2019
Business and Viability of Operations
Business and Viability of Operations	1. Business and Viability of Operations Summit Wireless Technologies, Inc. (also referred to herein as “we”, “us”, “our”, or the “Company”) was originally formed as a limited liability company in Delaware on July 23, 2010. The Company develops wireless audio integrated circuits for home entertainment and professional audio markets. On December 31, 2017, the Company converted from a Delaware limited liability company to a Delaware corporation (the “Conversion”). Prior to the Conversion, the Company had been taxed as a partnership for federal and state income tax purposes, such that the Company’s taxable income was reported by its members in their respective tax returns. Following the Conversion, the Company will be taxed as a corporation. In connection with the Conversion, the Company’s Board of Directors approved a 15‑for‑1 reverse split of the Company’s units into stock. All unit and stock data in this report have been retroactively adjusted to reflect the split. In connection with the Conversion, the Company authorized 20,000,000 shares of preferred stock and 200,000,000 shares of common stock and issued 324,821 shares of common stock to such investors previously holding 4,872,221 common membership interests and 2,762,594 shares of convertible preferred stock to such investors previously holding 41,438,818 preferred membership interests. Such shares of common stock and preferred stock were fully paid, nonassessable shares of stock of the Company. On July 26, 2018, the Company closed its initial public offering (“IPO”). The Company’s registration statement on Form S‑1 (File No. 333‑224267) relating to the IPO was declared effective by the Securities and Exchange Commission (“SEC”) on July 25, 2018. The shares of common stock began trading on The NASDAQ Capital Market under the ticker symbol “WISA” on July 27, 2018. Under the offering, the Company issued 2,400,000 shares of common stock at an offering price of $5.00 per share, raising gross proceeds of $12,000,000. In aggregate, the shares issued in the offering generated approximately $10,273,000 in net proceeds, which amount is net of $900,000 in underwriters’ discounts and commissions, $220,000 in underwriters’ accountable and non-accountable expenses and legal, accounting and other estimated offering costs of $607,000. Upon the closing of the IPO, (i) all shares of preferred stock then outstanding were automatically converted into 2,762,594 shares of common stock and (ii) all convertible notes payable along with accrued interest were automatically converted in to 9,527,144 shares of common stock, except for $200,000 of such notes which were repaid in cash immediately following the offering. On April 18, 2019, we entered into a Securities Purchase Agreement, dated as of April 18, 2019, with Ms. Walsh (the "Preferred SPA"), pursuant to which we issued 250,000 shares of our Series A 8% Senior Convertible Preferred Stock, par value $0.0001 per share (the "Series A Preferred Stock"), which shares have a stated value of $4.00, grant holders the same voting rights as holders of our shares of common stock, and are convertible into shares of our common stock at price of $4.00 per share, subject to a floor price of $1.50 and to adjustment under our Certificate of Designations of the Preferences, Rights and Limitations of the Series A Preferred Stock, in consideration for $1,000,000 (the "Initial Tranche"). The Series A Preferred Stock may be issued in tranches of at least $500,000 and in an aggregate of up to $5 million. In connection with the Initial Tranche, the Company also issued to the significant shareholder a warrant to purchase 255,102 shares of our common stock. On May 24, 2019, the Company closed a public offering of the Company’s common stock ("Public Offering"). The Company's registration statement on Form S-1 (File No. 333-230952) relating to the Public Offering was declared effective by the SEC on May 21, 2019. In connection with the Public Offering, the Company issued an aggregate of 4,075,726 shares of common stock at a public offering price of $1.33 per share for gross proceeds of approximately $5,420,000. The net proceeds to the Company, after deducting underwriting discounts and commissions and other offering expenses, were approximately $4,664,000. Liquidity and management plans The condensed consolidated financial statements of the Company have been prepared on a going concern basis, which contemplates the realization of assets and the discharge of liabilities in the normal course of business. The Company has incurred net operating losses each year since inception. As of June 30, 2019, the Company had cash and cash equivalents of $3.3 million, an accumulated deficit of approximately $181.0 million and has not generated positive cash flows from operations. The Company expects operating losses to continue in the foreseeable future because of additional costs and expenses related to research and development activities, plans to expand its product portfolio, and increase its market share. The Company’s ability to transition to attaining profitable operations is dependent upon achieving a level of revenues adequate to support its cost structure. Based on current operating levels, the Company will need to raise additional funds by selling additional equity or incurring debt. To date, the Company has not generated significant revenues and has funded its operations primarily through sales of its common stock in public markets, sales of common and preferred units prior to its IPO and proceeds from convertible notes. Additionally, future capital requirements will depend on many factors, including the rate of revenue growth, the selling price of the Company’s products, the expansion of sales and marketing activities, the timing and extent of spending on research and development efforts and the continuing market acceptance of the Company’s products. These factors raise substantial doubt about the Company’s ability to continue as a going concern. Management of the Company intends to raise additional funds through the issuance of equity securities or debt. There can be no assurance that, in the event the Company requires additional financing, such financing will be available at terms acceptable to the Company, if at all. Failure to generate sufficient cash flows from operations, raise additional capital and reduce discretionary spending could have a material adverse effect on the Company’s ability to achieve its intended business objectives. These factors raise substantial doubt about the Company’s ability to continue as a going concern. The accompanying condensed consolidated financial statements do not include any adjustments that might be necessary if the Company is unable to continue as a going concern.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and pursuant to Article 10 of Regulation S-X of the Securities Act of 1933, as amended (“Securities Act”). Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. These unaudited condensed consolidated financial statements include all normal and recurring adjustments that the Company believes are necessary to fairly state the Company’s financial position and the results of operations and cash flows. Interim period results are not necessarily indicative of results of operations or cash flows for a full year or any subsequent interim period. The condensed consolidated balance sheet as of December 31, 2018 has been derived from audited consolidated financial statements at that date, but does not include all disclosures required by U.S. GAAP for complete financial statements. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Reclassification Certain reclassifications have been made to prior periods' financial statements to conform to the current period presentation. These reclassifications did not result in any change in previously reported net loss, total assets or shareholders' equity. Concentration of Credit Risk and Other Risks and Uncertainties Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. Cash and cash equivalents are deposited in demand and money market accounts at one financial institution. At times, such deposits may be in excess of insured limits. The Company has not experienced any losses on its deposits of cash and cash equivalents. The Company’s accounts receivable are derived from revenue earned from customers located throughout the world. The Company performs credit evaluations of its customers’ financial condition and sometimes requires partial payment in advance of shipping. As of June 30, 2019, the Company had two customers accounting for 84% and 15% of accounts receivable. As of December 31, 2018, the Company had two customers accounting for 47% and 42% of accounts receivable. The Company had three customers accounting for 38%, 38% and 15% of its net revenue for the three months ended June 30, 2019. The Company had three customers accounting for 53%, 34% and 6% of its net revenue for the six months ended June 30, 2019. The Company had three customers accounting for 60%, 25% and 11% of its net revenue for the three months ended June 30, 2018. The Company had two customers accounting for 63% and 25% of its net revenue for the six months ended June 30, 2018. The Company’s future results of operations involve a number of risks and uncertainties. Factors that could affect the Company’s future operating results and cause actual results to vary materially from expectations include, but are not limited to, rapid technological change, continued acceptance of the Company’s products, competition from substitute products and larger companies, protection of proprietary technology, strategic relationships and dependence on key individuals. The Company relies on sole-source suppliers to manufacture some of the components used in its product. The Company’s manufacturers and suppliers may encounter problems during manufacturing due to a variety of reasons, any of which could delay or impede their ability to meet demand. The Company is heavily dependent on a single contractor in China for assembly and testing of its products, a single contractor in Japan for the production of its transmit semiconductor chip and a single contractor in China for the production of its receive semiconductor chip. Convertible Financial Instruments The Company bifurcates conversion options and warrants from their host instruments and accounts for them as freestanding derivative financial instruments if certain criteria are met. The criteria include circumstances in which (a) the economic characteristics and risks of the embedded derivative instrument are not clearly and closely related to the economic characteristics and risks of the host contract, (b) the hybrid instrument that embodies both the embedded derivative instrument and the host contract is not re-measured at fair value under otherwise applicable generally accepted accounting principles with changes in fair value reported in earnings as they occur and (c) a separate instrument with the same terms as the embedded derivative instrument would be considered a derivative instrument. An exception to this rule is when the host instrument is deemed to be conventional, as that term is described under applicable U.S. GAAP. When the Company has determined that the embedded conversion options and warrants should be bifurcated from their host instruments, discounts are recorded for the intrinsic value of conversion options embedded in the instruments based upon the differences between the fair value of the underlying common stock at the commitment date of the transaction and the effective conversion price embedded in the instrument. Debt discounts under these arrangements are amortized to interest expense using the interest method over the earlier of the term of the related debt or their earliest date of redemption. Warrants for Common Shares and Derivative Financial Instruments Warrants for common shares and other derivative financial instruments are classified as equity if the contracts (1) require physical settlement or net-share settlement or (2) give the Company a choice of net-cash settlement or settlement in its own shares (physical settlement or net-share settlement). Contracts which (1) require net-cash settlement (including a requirement to net cash settle the contract if an event occurs and if that event is outside the control of the Company), (2) give the counterparty a choice of net-cash settlement or settlement in shares (physical settlement or net-share settlement), or (3) that contain reset provisions that do not qualify for the scope exception are classified as equity or liabilities. The Company assesses classification of its warrants for common shares and other derivatives at each reporting date to determine whether a change in classification between equity and liabilities is required. The issuance of the convertible notes payable generated a beneficial conversion feature (“BCF”), which arises when a debt or equity security is issued with an embedded conversion option that is beneficial to the investor or in the money at inception because the conversion option has an effective strike price that is less than the market price of the underlying stock at the commitment date. The Company recognized the BCF by allocating the intrinsic value of the conversion option, which is the number of shares of common stock available upon conversion multiplied by the difference between the effective conversion price per share and the fair value of common stock per share on the commitment date, to common shares, resulting in a discount on the convertible debt. Revenue Recognition Revenue is recognized when control of the promised goods or services is transferred to customers, in an amount that reflects the consideration that we expect to be entitled to in exchange for those goods or services. Sales of products with alternative uses account for the majority of our revenue and are recognized at a point in time. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by us from a customer and deposited with the relevant government authority, are excluded from revenue. Our revenue arrangements do not contain significant financing components. Sales to certain distributors are made under arrangements which provide the distributors with price adjustments, price protection, stock rotation and other allowances under certain circumstances. The Company does not provide its customers with a contractual right of return. However, the Company accepts limited returns on a case-by-case basis. These returns, adjustments and other allowances are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenue recognized. We believe that there will not be significant changes to our estimates of variable consideration. If a customer pays consideration, or the Company has a right to an amount of consideration that is unconditional before we transfer a good or service to the customer, those amounts are classified as deferred income/advances received from customers which are included in other current liabilities when the payment is made or it is due, whichever is earlier. Comprehensive Loss Comprehensive loss includes all changes within stockholders’ equity that are not the result of transactions with stockholders. Accumulated other comprehensive loss includes the foreign currency translation adjustments arising from the consolidation of the Company’s foreign subsidiary. Foreign Currency The financial position and results of operations of the Company’s foreign operations are measured using currencies other than the U.S. dollar as their functional currencies. Accordingly, for these operations all assets and liabilities are translated into U.S. dollars at the current exchange rates as of the respective balance sheet date. Expense items are translated using the weighted average exchange rates prevailing during the period. Cumulative gains and losses from the translation of these operations’ financial statements are reported as a separate component of stockholders’ equity, while foreign currency transaction gains or losses, resulting from remeasuring local currency to the U.S. dollar are recorded in the condensed consolidated statement of operations in other income (expense), net and were not material for the three and six months ended June 30, 2019 and 2018. Advertising Costs Advertising costs are charged to sales and marketing expenses as incurred. Advertising costs for the three and six months ended June 30, 2019 and 2018 were not material. Net Loss per Common Share Basic net loss per common share is calculated by dividing the net loss attributable to common stockholders by the weighted average number of common shares outstanding during the period, without consideration for potentially dilutive securities. Diluted net loss per common share is computed by dividing the net loss attributable to common stockholders by the weighted average number of common shares and potentially dilutive common share equivalents outstanding for the period determined using the treasury-stock and if-converted methods. For purposes of the diluted net loss per common share calculation, preferred stock, warrants for common stock, restricted stock units and shares issuable upon the conversion of convertible notes payable are considered to be potentially dilutive securities. For the three and six months ended June 30, 2019, warrants to purchase 9,060,003 shares of common stock, 250,000 shares of preferred stock and 492,808 shares of restricted stock have been excluded from the calculation of net loss per common share because the inclusion would be antidilutive. For the three and six months ended June 30, 2018, warrants to purchase 7,366,944 shares of common stock, 2,762,594 shares of preferred stock, and 1,437,596 shares of restricted stock have been excluded from the calculation of net loss per common share because the inclusion would be antidilutive. In addition, shares issuable upon the conversion of convertible notes payable have been excluded from the calculation of net loss per common share for all periods presented because the inclusion would be antidilutive. Recently Issued and Adopted Accounting Pronouncements In June 2018, the Financial Accounting Standards Board (“FASB”) issued an Accounting Standards Update (“ASU”) No. 2018‑07, “Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting”. ASU 2018‑07 applies to all entities that enter into share-based payment transactions for acquiring goods and services from nonemployees. The amendments in ASU 2018‑07 expand the scope of Topic 718, Compensation - Stock Compensation, to include share-based payments transactions to nonemployees. Changes to the accounting for nonemployee awards as a result of ASU 2018‑07 include: 1) equity-classified nonemployee share-based payment awards are measured at the grant date, instead of the previous requirement to remeasure the awards through the performance completion date, 2) for awards with performance conditions, compensation cost is recognized when the achievement of the performance condition is probable, rather than upon achievement, and 3) the current requirement to reassess the classification (equity or liability) for nonemployee awards upon vesting is eliminated. ASU 2018‑07 clarifies that Topic 718 does not apply to financing transactions or awards granted to customers as part of a contract accounted for under Topic 606, Revenue from Contracts with Customers. The amendments in ASU 2018‑07 are effective for public business entities for fiscal years beginning after December 15, 2018. The Company adopted this guidance as of January 1, 2019 and the adoption did not have a significant impact on the condensed consolidated financial statements. Recently Issued and Not Yet Adopted Accounting Pronouncements In February 2016, the FASB issued ASU 2016‑02, “Leases”. The objective of the update is to increase transparency and comparability among organizations by recognizing lease assets and liabilities on the balance sheet for leases with a lease term of more than 12 months. In addition, the update will require additional disclosures regarding key information about leasing arrangements. Under existing guidance, operating leases are not recorded as lease assets and lease liabilities on the balance sheet. As an emerging growth company, the Company is allowed to adopt accounting pronouncements at the same time as non-public business entities. As a result, we have elected to adopt the update for our fiscal year beginning after December 15, 2019. The Company does not expect the adoption of this standard to significantly impact the condensed consolidated financial statements. In August 2018, the FASB issued ASU 2018‑13, Fair Value Measurement (Topic 820). The FASB developed the amendments to Accounting Standards Codification 820 as part of its broader disclosure framework project, which aims to improve the effectiveness of disclosures in the notes to financial statements by focusing on requirements that clearly communicate the most important information to users of the financial statements. This update eliminates certain disclosure requirements for fair value measurements for all entities, requires public entities to disclose certain new information and modifies some of the existing disclosure requirements. The standard will be effective for fiscal years beginning after December 15, 2019, including interim periods within such fiscal years, with early adoption permitted. The Company is evaluating the impact of ASU 2018‑13 on its condensed consolidated financial statements. We have reviewed other recent accounting pronouncements and concluded they are either not applicable to the business, or no material effect is expected on the condensed consolidated financial statements as a result of future adoption.

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jun. 30, 2019
Balance Sheet Components
Balance Sheet Components	3. Balance Sheet Components Inventories (in thousands): June 30, December 31, 2019 2018 Work in progress $ 304 $ 191 Finished goods 1,778 1,192 Total inventories $ 2,082 $ 1,383 Property and equipment, net (in thousands): June 30, December 31, 2019 2018 Machinery and equipment $ 771 $ 746 Tooling 7 7 Computer software 89 89 Furniture and fixtures 15 15 Leasehold improvements 11 11 893 868 Less: Accumulated depreciation and amortization (786) (758) Property and equipment, net $ 107 $ 110 Depreciation and amortization expense for the three months ended June 30, 2019 and 2018 was $14,000 and $9,000, respectively. Depreciation and amortization expense for the six months ended June 30, 2019 and 2018 was $28,000 and $19,000, respectively. Accrued liabilities (in thousands): June 30, December 31, 2019 2018 Accrued vacation $ 261 $ 238 Accrued compensation — 17 Accrued bonus — 158 Customer advances 131 186 Accrued other 368 247 Total accrued liabilities $ 760 $ 846

Promissory Notes

Promissory Notes	6 Months Ended
	Jun. 30, 2019
Promissory Notes
Promissory Notes	4. Promissory Notes In connection with the acquisition of the Focus Enhancements, Inc. assets in July 2010, the Company assumed an asset purchase agreement with Hallo Development Co, LLC (“Hallo”). In October 2010, the Hallo agreement was amended to require the Company to pay royalties to Hallo at specified rates based on annual net sales derived from the Company’s purchased technology over a period of three years with a minimum royalty of $900,000. Initial shipments commenced in 2011 and after three years, cumulative royalties due Hallo were $900,000. In April 2014, the Hallo agreement was amended, converting the outstanding balance of $358,000, to an unsecured promissory note (“Hallo Note”), bearing interest at 18.0% per year with an initial maturity date of December 31, 2015, that was later extended. In December 2016, following a principal reduction payment of $38,000, the Hallo Note was amended as follows: (i) the maturity date was changed to “five days following an IPO”, (ii) following a debt or equity financing in excess of $4,000,000, the Company would make a principal reduction payment of $13,000, (iii) on the maturity date, the Company would make a principal reduction payment of $95,000, and (iv) the remaining unpaid principal and accrued interest, after the payments described in (ii) and (iii) above, shall automatically convert to shares in connection with an initial public offering, at a conversion price equal to the average of the highest and the lowest price of the related stock that the Company sold on the maturity date. As a result of such amendment, the Hallo Note was reclassified to convertible notes payable as of December 31, 2016. As of February 28, 2018, the Hallo note holders agreed to amend the conversion price language in their respective convertible notes to be the lower of (i) $4.50 or (ii) the initial price of the Company’s common stock sold pursuant to an IPO and to extend the maturity date to June 30, 2018. The Company recognized interest expense of $10,000 and $20,000 for the three and six months ended June 30, 2018, respectively. The Company did not make any principal reduction payments under the Hallo Note during the three and six months ended June 30, 2018. On July 25, 2018, the outstanding convertible note automatically converted into 56,723 shares of common stock in connection with the Company’s IPO. On January 5, 2015, we entered into a Loan and Securities Agreement and a separate Secured Promissory Note with the principal face value of $500,000 (the “January 2015 Note”). The personal property, fixtures and intellectual property and products of the Company serve as the collateral for the borrowing. The initial interest rate was 15.0% per year with an initial maturity date of July 5, 2015, that was later extended. In February 2016, following a principal reduction payment of $225,000, the maturity date was extended to September 1, 2017, and the interest rate was adjusted to 10.0% per year. In December 2016, following a principal reduction payment of $23,000, the January 2015 Note was amended as follows: (i) the maturity date was changed to “five days following an IPO”, (ii) following a debt or equity financing in excess of $4,000,000 prior to an IPO, the Company would make a principal reduction payment of $13,000, (iii) on the maturity date, the Company would make a principal reduction payment of $95,000, and (iv) the remaining unpaid principal and accrued interest, after the payments described in (ii) and (iii) above, shall automatically convert to shares in connection with the IPO, at a conversion price equal to the average of the highest and the lowest price of the related stock that the Company sold on the maturity date. As a result of such amendment, the January 2015 Note was reclassified to convertible notes payable as of December 31, 2016. As of February 28, 2018, the January 2015 Note holders agreed to amend the conversion price language in their respective convertible notes to be the lower of (i) $4.50 or (ii) the initial price of the Company’s common stock sold pursuant to an IPO and to extend the maturity date to June 30, 2018. The Company recognized interest expense of $4,000 and $9,000 for the three and six months ended June 30, 2018. The Company did not make principal reduction payments under the January 2015 Note during the three and six months ended June 30, 2018. On July 25, 2018, the outstanding convertible note automatically converted into 39,653 shares of common stock in connection with the Company’s IPO. On April 4, 2015, we entered into a Loan and Securities Agreement and a separate Secured Promissory Note with the principal face value of $450,000 (the “April 2015 Note”). The proceeds from April 2015 Note were used to repay the $450,000 loan outstanding with a bank. The personal property, fixtures and intellectual property and products of the Company serve as the collateral for the borrowing. Interest accrues at a rate 5.0% per year during the first twelve months and increases to 10.0% per year through maturity. All principal and related accrued interest outstanding are due and payable at the maturity date, which was originally January 31, 2017. In November 2016, the April 2015 Note was amended to (i) change the maturity date to September 1, 2017 and (ii) provide that if the Company completes an underwritten public offering of its common shares or consummates a change of control, then the aggregate outstanding principal and related accrued interest will automatically convert into the number of common shares equal to the quotient obtained by dividing the aggregate principal and accrued interest by the conversion price. The conversion price is the lesser of $4.50 or the highest price per common share sold in the IPO or paid by a buyer upon a change in control multiplied by 75%. As a result of such amendment, the April 2015 Note was reclassified to convertible notes payable. As of February 28, 2018, the April 2015 Note holder agreed to extend the maturity date to June 30, 2018. The Company recognized interest expense of $11,000 and $22,000 for the three and six months ended June 30, 2018. On July 25, 2018, the outstanding convertible note automatically converted into 155,373 shares of common stock in connection with the Company’s IPO. On September 18, 2015, we entered into a Loan and Securities Agreement and a separate Secured Promissory Note with the principal face value of $200,000 (the “September 2015 Note”). The personal property, fixtures and intellectual property and products of the Company serve as the collateral for the borrowing. Interest accrues at a rate 10.0% per year through maturity. All principal and related accrued interest outstanding are due and payable at the maturity date, which was originally January 31, 2017. In November 2016, the September 2015 Note was amended to (i) change the maturity date to September 1, 2017 and (ii) provide that if the Company completes an underwritten public offering of its common shares or consummates a change of control, then the aggregate outstanding principal and related accrued interest will automatically convert in to the number of common shares equal to the quotient obtained by dividing the aggregate principal and accrued interest by the conversion price. The conversion price is the lesser of $4.50 or the highest price per common share sold in the IPO or paid by a buyer upon a change in control multiplied by 75%. As a result of such amendment, the September 2015 Note was reclassified to convertible notes payable. As of February 28, 2018, the September 2015 Note holder agreed to extend the maturity date to June 30, 2018. The Company recognized interest expense of $5,000 and $9,900 for the three and six months ended June 30, 2018. On July 25, 2018, the outstanding convertible note automatically converted into 68,544 shares of common stock in connection with the Company’s IPO. In connection with the sale of product on December 22, 2015, we entered into a Loan and Securities Agreement and a separate Secured Promissory Note with the principal face value of $353,000 (the “December 2015 Note”). The principal amount represented as advance on the product sale. The personal property, fixtures and intellectual property and products of the Company served as the collateral for the borrowing (see Note 5 – Series E Convertible Note Payable for subsequent release of collateral). Interest accrues at a rate 12.0% per year through maturity. All principal and related accrued interest outstanding are due and payable at the maturity date, which was originally September 22, 2016, that was later extended. In December 2016, the December 2015 Note was amended to (i) change the maturity date to September 1, 2017 and (ii) provide that if the Company completes an underwritten public offering of its common shares or consummates a change of control, then the aggregate outstanding principal and related accrued interest will automatically convert in to the number of common shares equal to the quotient obtained by dividing the aggregate principal and accrued interest by the conversion price. The conversion price is the lesser of $4.50 or the highest price per common share sold in an initial public offering or paid by a buyer upon a change in control multiplied by 75%. As a result of such amendment, the December 2015 Note was reclassified to convertible notes payable. As of December 31, 2017, the December 2015 Note had a zero principal balance as the Company had fulfilled its obligation to ship product to the lender. On July 25, 2018, the outstanding accrued interest on the December 2015 Note automatically converted into 11,295 shares of common stock in connection with the Company’s IPO. During February 2016, we entered into five different Loan and Securities Agreements and separate Secured Promissory Notes with a total principal face value of $250,000 (the “Five February 2016 Notes”). The personal property, fixtures and intellectual property and products of the Company serve as the collateral for the borrowings. Interest accrues at a rate 10.0% per year through maturity. All principal and related accrued interest outstanding are due and payable at the maturity date, which was originally February 1, 2017, that was later extended. In December 2016, two of the Five February 2016 Notes were terminated and extinguished and the lenders agreed that the $100,000 aggregate principal balance of the loans and the $9,000 aggregate accrued interest would be used to fund their participation in the Series D convertible notes. In May 2017, the three remaining holders of the Five February 2016 Notes agreed to amend their notes to include a provision that if the Company completes an underwritten public offering of its common shares or consummates a change of control, then the aggregate outstanding principal and related accrued interest will automatically convert in to the number of common shares equal to the quotient obtained by dividing the aggregate principal and accrued interest by the conversion price. The conversion price is the lesser of $4.50 or the highest price per common share sold in the IPO or paid by a buyer upon a change in control multiplied by 75%. As a result of such amendment, the three remaining Five February 2016 Notes were reclassified to convertible notes payable. Effective February 28, 2018, the February 2016 Note holders agreed to extend the maturity date to June 30, 2018. The Company recognized interest expense of $4,000 and $7,500 for the three and six months ended June 30, 2018. On July 25, 2018, the outstanding convertible notes automatically converted into 49,815 shares of common stock in connection with the Company’s IPO. In connection with the Five February 2016 Notes, the Company issued warrants to purchase common shares of 111,112 (see Note 6 – Fair Value Measurements for fair value computation). The sum of the fair value of the warrants was recorded as a debt discount to be amortized over the respective terms of the various notes. The debt discounts are amortized to interest expense using the effective interest method. During the three and six months ended June 30, 2019 and 2018, the Company recognized $0 from the amortization of the debt discount.

Convertible Notes Payable

Convertible Notes Payable	6 Months Ended
	Jun. 30, 2019
Convertible Notes Payable
Convertible Notes Payable	5. Convertible Notes Payable As of July 25, 2018, the convertible notes payable and related accrued interest were converted in to 9,527,144 shares of common stock in connection with the Company’s IPO. No convertible notes payable were outstanding as of December 31, 2018. On February 12, 2016, we entered into a Loan and Securities Agreement and a separate Secured Promissory Note with the principal face value of $300,000 (the “February 2016 Note”). The personal property, fixtures and intellectual property and products of the Company serve as the collateral for the borrowing (see Note 5 – Series E Convertible Note Payable for subsequent release of collateral). Interest accrues at a rate 10.0% per year through maturity. All principal and related accrued interest outstanding are due and payable at the maturity date, which was originally January 31, 2017. In November 2016, the February 2016 Note was amended to (i) change the maturity date to September 1, 2017 and (ii) provide that if the Company completes an underwritten public offering of its common shares or consummates a change of control, then the aggregate outstanding principal and related accrued interest will automatically convert in to the number of common shares equal to the quotient obtained by dividing the aggregate principal and accrued interest by the conversion price. The conversion price is the lesser of $4.50 or the highest price per common share sold in the IPO or paid by a buyer upon a change in control multiplied by 75%. As a result of such amendment, the February 2016 Note was reclassified to convertible notes payable. As of February 28, 2018, the February 2016 Note holders agreed to extend the maturity date to June 30, 2018. The Company recognized interest expense of $8,000 and $15,000 for the three and six months ended June 30, 2018. On July 25, 2018, the outstanding convertible note automatically converted into 99,594 shares of common stock in connection with the Company’s IPO. In connection with the February 2016 Note, the Company issued warrants to purchase 33,334 common shares (see Note 6 – Fair Value Measurements for fair value computation). The sum of the fair value of the warrants for the February 2016 Note was recorded as a debt discount and is being amortized to interest expense over the term of the note using the effective interest method. During the three and six months ended June 30, 2018, the Company recognized interest expense of $0 from the amortization of the debt discount. On May 11, 2016, a significant shareholder provided a $300,000 unsecured advance to the Company (the “May 2016 Advance”) in contemplation of participating in the Preferred Unit Purchase Agreement dated April 12, 2016, which required the significant shareholder to invest a minimum of $500,000. In July 2016, the significant shareholder invested an additional $201,000 and requested the May 2016 Advance be cancelled and its principal be aggregated with the $201,000 to purchase a total of 111,307 preferred shares at $4.50 per share. Series C Convertible Notes Payable During February 2016 through October 2016, the Company received total proceeds of $2,880,000 from the issuance of original issue discount convertible notes (“Series C Convertible Notes”) to investors. The principal balance, plus all accrued and unpaid interest, was due February 28, 2018, as amended, or upon a change of control or an initial public offering by the Company. On February 28, 2018, in connection with the extension of the maturity date to August 28, 2018, the Company issued 327 shares of common stock to the holder of the convertible notes. The conversion price in effect upon an initial public offering is the lesser of $9.00 or the price per common share in the pre-money valuation immediately prior to the initial public offering multiplied by 80%. The conversion price at any other conversion event is $9.00. Issuance costs to obtain the convertible notes were recorded as a debt discount in the amount of $209,000. The Company recognized interest expense of $0 for the three and six months ended June 30, 2018. On July 25, 2018, the outstanding convertible note automatically converted into 7,353 shares of common stock in connection with the Company’s IPO. In connection with the Series C Convertible Notes, the Company issued warrants to investors and investment bankers to purchase common shares of 188,236 and 26,354, respectively (see Note 6 – Fair Value Measurements for fair value computation). The sum of the fair value of the warrants, the BCF and issuance costs for the Series C Convertible Notes were recorded as debt discounts to be amortized to interest expense over the respective term using the effective interest method. During the three and six months ended June 30, 2018, the Company recognized interest expense of $0 from the amortization of the debt discounts. Between November and December 2016, all of the Series C Convertible Notes, except for $25,000, were extinguished and converted to Series D Convertible Notes. Series D Convertible Notes Payable On various dates in 2016 and 2017, the Company received total proceeds of $4,717,000 from the issuance of original issue discount convertible notes (“Series D Convertible Notes”) to investors. In addition, the Company: (i) extinguished Series C Convertible Notes in the amount of $2,855,000 along with accrued interest of $172,000 and converted those to Series D Convertible Notes; (ii) extinguished other promissory notes in the amount of $236,000 along with accrued interest of $19,000 and converted those to Series D Convertible Notes; (iii) allowed Mr. Moyer to convert $69,000 of reimbursable expense reports into Series D Convertible Notes; and (iv) allowed Mr. Jonathan Gazdak, a member of the Company’s Board of Directors, to convert $12,000 of certain expenses into Series D Convertible Notes. At the date of issuance, the Series D Convertible Notes had a senior priority security interest in all the personal property, fixtures and intellectual property and products of the Company except for the January 2015 Note and the Hallo Note which had a pari passu security interest with the Series D Convertible Notes (see Note 5 – Series E Convertible Note Payable for subsequent release of security interest). The principal balance, plus all accrued and unpaid interest is due on September 30, 2018, as amended. The Series D Convertible Notes are eligible for conversion at any point prior to the maturity date or upon a change of control or an initial public offering by the Company. The conversion price in effect upon on initial public offering is the lesser of $4.50 or the highest price per common share sold in the initial public offering multiplied by 75%. The conversion price at any other conversion event is $4.50. Issuance costs to obtain the convertible notes were recorded as a debt discount in the amount of $386,000. In connection with the February 28, 2018 extension of the maturity date, the Company confirmed to the holders of the Series D Convertible Notes that Series D Convertible Notes would accrue an additional 10% interest on the first day of every month, beginning March 1, 2018, so long as such Series D Convertible Notes remained outstanding. The Company recognized interest expense of $2,837,000 and $3,845,000 for the three and six months ended June 30, 2018. On July 25, 2018, the outstanding convertible notes automatically converted into 3,783,334 shares of common stock in connection with the Company’s IPO. In connection with the Series D Convertible Notes, the Company issued warrants to investors and investment bankers to purchase common shares of 1,017,692 and 380,449, respectively (see Note 6 – Fair Value Measurements for fair value computation). The sum of the fair value of the warrants, the BCF, the embedded conversion feature and issuance costs for the Series D Convertible Notes described above were recorded as debt discounts to be amortized to interest expense over the respective term using the effective interest method. In connection with the extension of the maturity date to June 30, 2018, the Company confirmed to the holders of the Series D Convertible Notes that the warrants issued in connection with the Series D Convertible Notes would double effective February 28, 2018. The number of warrants outstanding as of June 30, 2019 was therefore 2,035,434. During the three and six months ended June 30, 2018, the Company recognized interest expense of $1,402,000 and $2,875,000 from the amortization of the debt discounts. Series E Convertible Notes Payable On various dates from May to September 2017, the Company received total proceeds of $5,000,000 from the issuance of original issue discount convertible promissory notes (“Series E Convertible Note”). The Series E Convertible Notes have a senior priority security interest in all the personal property, fixtures and intellectual property and products of the Company. The principal balance of the Series E Convertible Notes, was due on October 31, 2017. The Series E Convertible Notes were eligible for conversion at any point prior to the maturity date or upon a change of control or an initial public offering by the Company. The conversion price in effect upon on initial public offering is the lesser of $4.50 or the highest price per common share sold in the initial public offering multiplied by 75%. The conversion price at any other conversion event is the lessor of $4.50 or the price per share issued by the Company in connection with any sale involving substantially all the assets of the Company. Additionally, in connection with the Series E Convertible Note financing, all of the Company’s outstanding promissory and convertible note holders agreed to: (i) subordinate their notes to the Series E Convertible Notes, (ii) release all security interests in the Company’s assets in favor of the Series E Convertible Notes (iii) extend their maturity dates to February 28, 2018 and (iv) amend the Company’s Operating Agreement to allow the Series E Convertible Note lender one seat on the Company’s Board of Directors so long as the investor owns any debt or securities of the Company. Issuance costs to obtain the convertible notes were recorded as a debt discount in the amount of $275,000. On October 31, 2017, the Company filed a confidential S‑1 registration statement with the SEC (“S‑1”) with the belief that the S‑1 filing would extend the maturity date of the Series E Convertible Notes to November 30, 2017. The Series E Convertible Note holders claimed that the S‑1 filing did not meet the definition outlined in the Series E Convertible Note and issued a notice of default to the Company on November 2, 2017 (“Default Notice”). On November 30, 2017, as a result of the Default Notice and an inability of the two parties to renegotiate the Series E Convertible Notes under acceptable terms, the Company requested and received a Series E Convertible Note payoff letter (“Series E Payoff Letter”) from the Series E Convertible Note holders. The Series E Payoff Letter stated that in addition to the repayment of the Series E Convertible Notes of $5,882,000, that the Series E Convertible Note holders were due, $1,098,000 of default interest and penalties, reimbursement of $179,000 of legal fees, and consulting, travel and lodging fees of $102,000. Despite the Company’s disagreement that it was in default and subject to default penalties, interest and legal fees, the Company paid the full monetary demand of $7,261,000 as requested by the Series E Convertible Note holders on November 30, 2017. As a result, the Company recognized interest expense including default interest and penalties of $1,980,000 and additional general and administrative expenses of $281,000 which was comprised of Series E Note holder’s legal fees and consulting expenses of $179,000 and $102,000, respectively, for the year ended December 31, 2017. In addition, the note holder claimed that the Company was obligated to issue an additional 487,865 warrants in connection with the Default Notice. Pursuant to a settlement agreement that the Company entered into with note holder on July 25, 2018 a warrant to purchase an aggregate of 487,864 shares of common stock was issued (see Note 6 – Fair Value Measurements for fair value computation). In connection with the Series E Convertible Notes, the Company issued warrants to investors and investment bankers to purchase common shares of 1,307,190 and 114,380, respectively (see Note 6 – Fair Value Measurements for fair value computation). On November 30, 2017, in connection with a provision in the Series E Convertible Note warrants issued to investors (Series E Investor Warrants), the outstanding Series E Investor Warrants doubled, as the Company had not completed an initial public offering by November 30, 2017. Therefore, total warrants outstanding to investors under the Series E Convertible Notes are 3,102,245. The sum of the fair value of the warrants, the BCF, the embedded conversion feature and issuance costs for the Series E Convertible Notes described above were recorded as debt discounts to be amortized to interest expense over the respective term using the effective interest method. During the three and six months ended June 30, 2018, the Company recognized interest expense of $70,000 from the amortization of the debt discounts. Series F Convertible Notes Payable On various dates between November 2017 and March 2018, the Company received total proceeds of $10,345,000 from the issuance of senior secured convertible promissory notes (“Series F Convertible Notes”) to investors. The Series F Convertible Notes accrue interest at 15% per year and have a senior priority security interest in all the personal property, fixtures and intellectual property and products of the Company. The principal balance of the Series F Convertible Notes, plus all accrued interest is due on June 30, 2018. The Series F Convertible Notes are eligible for conversion at any point prior to the maturity date at the option of the holder. The conversion price in effect upon on an initial public offering shall be the lesser of $4.50 or the highest price per common share sold in the initial public offering multiplied by 60%. The conversion price at any other conversion event shall be $4.50. Between April 1, 2018 and May 25, 2018, the Company issued $225,000 of additional Series F Convertible Notes. In connection with the additional Series F Convertible Notes the Company issued 25,000 and 5,000 warrants to purchase common stock, to its lenders and investment bankers, respectively. The warrants have a five-year life and are exercisable into common stock at $5.40 per share. Issuance costs to obtain the convertible notes were recorded as a debt discount in the amount of $135,000. The Company recognized interest expense of $393,000 and $757,000 for the three and six months ended June 30, 2018. On July 25, 2018, the outstanding convertible notes automatically converted into 3,849,210 shares of common stock in connection with the Company’s IPO. In connection with the issuance of the Series F Convertible Notes, the Company issued warrants to the lender and investment bankers to purchase common shares of 1,174,447 and 233,111, respectively (see Note 6 – Fair Value Measurements for fair value computation). The sum of the fair value of the warrants, the BCF, the embedded conversion feature and issuance costs for the Series F Convertible Notes described above were recorded as debt discounts to be amortized to interest expense over the respective term using the effective interest method. During the three and six months ended June 30, 2018, the Company recognized interest expense of $5,124,000 and $10,669,000, respectively, from the amortization of the debt discounts. Extension of Maturity Date The Company’s Series D and Series F convertible promissory notes as well as its other convertible promissory notes, excluding its Series C Convertible Notes and its Series G Notes, had maturity dates of June 30, 2018 (the “June 30 th Notes”). On June 30, 2018, the June 30 th Notes with a principal balance of $26.4 million went into default. The Company obtained consents from the holders of such notes to initially extend the maturity date of the June 30 th Notes to July 15, 2018 and then requested and received consents to extend the maturity date to July 25, 2018 at which time they converted to common stock in connection with the Company’s IPO. Series G Notes Payable Between April 20, 2018 and June 29, 2018, the Company issued $2,813,000 of 15% OID Senior Secured Promissory Notes due June 15, 2018 (“Series G Notes”) raising an aggregate principal amount of $2,200,000 and cancelling $50,000 of expense reimbursement payable by the Company to Mr. Brett Moyer, the Company’s President, Chief Executive Officer and a board member. Medalist Partners Harvest Master Fund, Ltd. and Medalist Partners Opportunity Master Fund A, LP, each of which Mr. Brian Herr, a member of the Company’s board of directors, is co-portfolio manager, have each participated in the Series G Notes financing. The Series G Notes have a senior priority security interest in all the personal property, fixtures and intellectual property and products of the Company. Additionally, in connection with the Series G Note financing, all of the Company’s Series F Convertible Note holders were required by the terms of the Series G Notes to subordinate their notes to the Series G Notes. As of June 15, 2018, the Company was in default on $1,725,000 of the Series G Notes. On June 28, 2018, the Company and the holders of the Series G Notes agreed to extend the maturity date of such notes from June 30, 2018 to July 15, 2018 in consideration for increasing the original issue discount of such notes from 15% to 20% and the issuance of warrants to purchase 208,350 shares of common stock. As of July 15, 2018, the Company was in default on $2,813,000 of the Series G Notes. On July 20, 2018, the Company and the holders of the Series G Notes agreed to (i) extend the maturity date of such notes from July 15, 2018 to July 25, 2018 and (ii) agreed to make the Series G Notes automatically convertible in connection with an initial public offering at a conversion price of the lesser of $4.50 or 40% of the highest price of the common stock sold in an initial public offering. In consideration for the extension of the maturity date and the agreement to make the Series G Notes automatically convertible, the Company agreed to issue warrants to purchase an additional 625,000 shares of common stock to the Series G Note holders. As a result of the agreement, the Series G Notes were reclassified from promissory notes to convertible notes payable as of the date of the agreement. The Company has recognized interest expense of $450,000 for the three and six months ended June 30, 2018. On July 25, 2018, the outstanding convertible notes automatically converted into 1,406,250 shares of common stock in connection with the Company’s IPO. In connection with the issuance of the Series G Notes, the Company issued warrants to the lender and investment bankers to purchase common shares of 833,350 and 58,334, respectively (see Note 6 – Fair Value Measurements for fair value computation). The sum of the fair value of the warrants, the BCF, the embedded conversion feature and issuance costs for the Series G Convertible Notes described above were recorded as debt discounts to be amortized to interest expense over the respective term using the effective interest method. During the three and six months ended June 30, 2018, the Company recognized interest expense of $197,000 from the amortization of the debt discounts. Derivative Liability The February 2016 Note, the Series C Convertible Notes, the Series D Convertible Notes, the Series E Convertible Notes, the Series F Convertible Notes, and the Series G Convertible Notes contain an embedded conversion feature that the Company has determined is a derivative requiring bifurcation. In July 2018, the derivative liability was reclassified to additional paid-in capital as of the date of the Company’s IPO.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
Fair Value Measurements
Fair Value Measurements	6. Fair Value Measurements The Company measures the fair value of financial instruments using a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. Each level of input has different levels of subjectivity and difficulty involved in determining fair value. · Level 1 – Inputs used to measure fair value are unadjusted quoted prices that are available in active markets for the identical assets or liabilities as of the reporting date. Therefore, determining fair value for Level 1 investments generally does not require significant judgment, and the estimation is not difficult. · Level 2 – Pricing is provided by third-party sources of market information obtained through investment advisors. The Company does not adjust for or apply any additional assumptions or estimates to the pricing information received from its advisors. · Level 3 – Inputs used to measure fair value are unobservable inputs that are supported by little or no market activity and reflect the use of significant management judgment. These values are generally determined using pricing models for which the assumptions utilize management’s estimates of market participant assumptions. The determination of fair value for Level 3 instruments involves the most management judgment and subjectivity. The Company’s financial assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 by level within the fair value hierarchy, are as follows: (in thousands) June 30, 2019 Significant Quoted prices other Significant in active observable unobservable markets inputs inputs (Level 1) (Level 2) (Level 3) Liabilities: Derivative liability $ — $ — $ 387 Warrant liability $ — $ — $ 39 (in thousands) December 31, 2018 Significant Quoted prices other Significant in active observable unobservable markets inputs inputs (Level 1) (Level 2) (Level 3) Liabilities: Warrant liability $ — $ — $ 210 There were no transfers between Level 1, 2 or 3 during the three and six months ended June 30, 2019 or June 30, 2018. Warrant Liability The following table includes a summary of changes in fair value of the Company’s warrant liability measured at fair value using significant unobservable inputs (Level 3) for the three and six months ended June 30, 2019 and 2018: For the three months ended For the six months ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Beginning balance $ 103 927 $ 210 1,228 Additions — 65 4 65 Change in fair value (64) 4,358 (175) 4,249 Reclass to additional paid-in capital — — — (192) Ending balance $ 39 $ 5,350 $ 39 $ 5,350 The changes in fair value of the warrant liability are recorded in change in fair value of warrant liability in the condensed consolidated statements of operations. A summary of the weighted average significant unobservable inputs (Level 3 inputs) used in measuring the Company’s warrant liability that is categorized within Level 3 of the fair value hierarchy as of June 30, 2019 and December 31, 2018 is as follows: June 30, 2019 December 31, 2018 Common Stock Price $ 1.16 $ 3.42 Term (Years) 3.77 4.27 Volatility 59 % 58 % Risk-free rate of interest 1.74 % 2.58 % Dividend Yield 0.0 % 0.0 % Derivative Liability The following table includes a summary of changes in fair value of the Company’s derivative liability measured at fair value using significant unobservable inputs (Level 3) for the three and six months ended June 30, 2019 and June 30, 2018: (in thousands) For the three months ended For the six months ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Beginning balance $ — $ 22,959 $ — $ 20,832 Additions 216 245 216 1,558 Change in fair value 171 2,572 171 3,386 Ending balance $ 387 $ 25,776 $ 387 $ 25,776 As of June 30, 2018, the Company measured the fair value of the derivative by estimating the fair value of the convertible notes payable at certain conversion points. To calculate the fair value of the convertible notes payable with the conversion feature, the Company calculated the present value of the convertible notes payable upon conversion at a qualifying initial public offering in the second quarter of 2018, and the present value of the convertible notes payable at non-qualifying initial public offering in the last quarter of 2018. The Company estimated a probability of 75% for the occurrence of a qualifying initial public offering in the second quarter of 2018 and a probability of 25% in the last quarter of 2018. The Company’s derivative liabilities were measured at fair value using the Probability Weighted Expected Return valuation methodology. As of June 30, 2019, the Company measured the fair value of the derivative by estimating the fair value of the Series A Convertible Preferred Stock as if conversion occurred on June 30, 2019. The Company calculated value of the conversion feature using the Fixed Conversion Price of the Series A Preferred Stock, as adjusted to 95% of the volume weighted average price of the common stock for the previous ten trading days and the specified floor price of $1.50.

Preferred Stock and Stockholder

Preferred Stock and Stockholders' Equity	6 Months Ended
	Jun. 30, 2019
Preferred Stock and Stockholders' Equity
Preferred Stock and Stockholders' Equity	7. Preferred Stock and Stockholders’ Equity Preferred Stock On July 26, 2018, upon the closing of the IPO, all shares of preferred stock then outstanding were automatically converted into 2,762,594 shares of common stock. Series A 8% Senior Convertible Preferred Stock On April 18, 2019, the Company entered into a Securities Purchase Agreement, dated as of April 18, 2019, with Ms. Walsh (the “Preferred SPA”), pursuant to which we issued 250,000 shares of our Series A Preferred Stock, par value $0.0001 per share, which shares have a stated value of $4.00 (the “Stated Value”), grant holders the same voting rights as holders of our shares of common stock, and are convertible into shares of our common stock at price of $4.00 per share, subject to a floor price of $1.50 and to adjustment under our Certificate of Designations of the Preferences, Rights and Limitations of the Series A Preferred Stock (the “Certificate of Designations”), in consideration for $1,000,000 (the “Initial Tranche”). The Series A Preferred Stock may be issued in tranches of at least $500,000 and in an aggregate of up to $5 million. In connection with the Initial Tranche, the Company also issued to Ms. Walsh a warrant to purchase 255,102 shares of our common stock. The Series A Preferred Stock contains an embedded conversion feature that the Company has determined is a derivative requiring bifurcation. The fair value of the derivative liability at the issuance of the Series A Preferred Stock was $216,000, which was recorded as a derivative liability with the offset recorded as a discount to the Series A Preferred Stock. (See Note 6 – Fair Value Measurements for the fair value computation.) The authorized, issued and outstanding shares of Series A Preferred Stock and liquidation preferences as of June 30, 2019, were as follows: Number Proceeds Number of Shares Net of Conversion of Shares Issued and Issuance Price per Liquidation Authorized Outstanding Costs Share Preference Series A 8 % Senior Convertible Preferred Stock 250,000 $ 920,000 $ 4.00 $ 1,016,000 The Series A Preferred Stock rights, privileges and preferences are as follows: Dividends — The holders of the Series A Preferred Stock are entitled to receive cumulative dividends at the rate per share of 8% per annum, payable on conversion. The form of the dividend payment on the Series A Preferred Stock will be determined based on the legal availability of funds for the payment and the satisfaction of the Equity Conditions (as defined in the Certificate of Designations) for the 5 consecutive trading days immediately prior to the payment date. The form of the payment, depending on the priority, may be made in cash or shares of common stock at the Company’s option. If funds are not available and the Equity Conditions have not been met, the dividends will accrue to the next payment date or accrete to the Stated Value. The Company accrued dividends of $16,000 for the three months ended June 30, 2019. Liquidation Rights — In the event of any liquidation, dissolution, or winding-up of the Company, each holder of Series A Preferred Stock is entitled to receive an amount equal to the Stated Value, plus accrued and unpaid dividends and any other fees or liquidated damages before any distribution will be made to holders of junior securities. If assets are insufficient for such payment, then the entire assets will be distributed only to the holders of the Series A Preferred Stock. A fundamental or change of control transaction is not deemed a liquidation. Conversion — Each share of Series A Preferred Stock is convertible at the option of the holder into the number of shares of common stock (subject to adjustment for certain events, including dilutive issuances, stock splits, and reclassifications) determined by multiplying such number by the ratio of the Stated Value by a conversion price, which price is originally equal to $4.00 (the “Fixed Conversion Price”). However, if the closing price of the common stock is less than the Fixed Conversion Price, then the Fixed Conversion Price may be reduced to equal 95% of the lowest volume weighted average price of the common stock for the previous 10 trading days, which price shall not be less than $1.50. Notwithstanding the foregoing, unless the Company obtains stockholder approval pursuant to the rules and regulations of The NASDAQ Capital Market, the Company cannot issue shares of common stock upon conversion of the Series A Preferred Stock in the event that such issuance exceeds 19.99% of the issued and outstanding shares of the Company’s common stock as of April 18, 2019 or if such conversion is considered a “change of control” under NASDAQ rules and regulations. Voting Rights — Each holder has the right to one vote for each share of common stock into which such preferred stock could be converted. So long as any shares of Series A Preferred Stock are outstanding, the Company shall not, without first obtaining the approval of more than 67% of the holders of Series A Preferred Stock then outstanding, voting together as a separate class (a) alter or amend the Certificate of Designations or alter or change adversely the powers, rights or preferences of the Series A Preferred Stock, including amending the Company’s certificate of incorporation or other charter documents in any manner adversely affecting the holders of the Series A Preferred Stock ; (b) authorize or create any class of stock ranking as to dividends, redemption or distribution of assets upon a liquidation senior to, or otherwise pari passu with, the Series A Preferred Stock; (c) increase the total number of authorized shares of Series A Preferred Stock; or (d) enter into any agreement with respect to any of the foregoing. Redemption — The Series A Preferred Stock is not mandatorily redeemable as it does not have a set redemption date or a date after which the shares may be redeemed by the holders. However, if a Triggering Event (as defined in the Certificate of Designations) occurs, then each holder will receive 120% of the aggregate Stated Value, plus all accrued and unpaid dividends and any other fees or liquidated damages. Additionally, upon such an event, the divided rate of the Series A Preferred Stock increases to 18% per annum. A Triggering Event is defined as any (1) default on credit obligations; (2) default on payment of certain Series A Preferred Stock payments or a default under the Certificate of Designations and any related transaction document entered into in connection with the issuance of the Series A Preferred Stock; (3) bankruptcy of the Company; (4) ineligibility for listing of the Company’s common stock on a trading market; (5) change of control or fundamental transaction entered into by the Company, or other transaction entered into by the Company where more than 51% of the Company’s assets are sold; (6) failure of the Company to perform certain regulatory reporting; (7) failure to timely deliver certificates representing shares of common stock upon conversion of the shares of Series A Preferred Stock; (8) failure of the Company to maintain a sufficient number of reserved shares pursuant to the Preferred SPA; and (9) judgment is entered or filed against the Company or its subsidiaries in excess of an aggregate of $100,000 or the Company or any of its subsidiaries experiences a loss of property in excess of an aggregate of $100,000. The Company has elected not to adjust the carrying values of the Series A Preferred Stock to the liquidation preferences of such shares because it is uncertain whether or when an event would occur that would obligate the Company to pay the liquidation preferences to holders of shares and at the balance sheet date, these circumstances were not probable. Subsequent adjustments to the carrying values of the liquidation preferences will be made only when it becomes probable that such a liquidation event will occur. Common Stock On January 30, 2018, the Company’s Board of Directors approved the establishment of the Company’s 2018 Long-Term Stock Incentive Plan (the “LTIP”) and termination of its Carve-Out Plan (the “Plan”). Under the LTIP, the aggregate maximum number of shares of common stock (including shares underlying options) that may be issued under the LTIP pursuant to awards of restricted shares or options will be limited to 15% of the outstanding shares of common stock, which calculation shall be made on the first (1st) business day of each new fiscal year; provided that for fiscal year 2018, upon approval of the LTIP by the Company’s shareholders, up to 300,000 shares of common stock will initially be available for participants under the LTIP. Thereafter, the 15% evergreen provision shall govern the LTIP. For fiscal year 2019, up to 2,304,909 shares of common stock are available for participants under the LTIP. In connection with the termination of the Plan, on January 31, 2018, the Company issued to its employees and directors 1,284,470 and 153,126, shares of restricted common stock (“January 2018 Restricted Stock Grant”), respectively. Such shares of restricted common stock were granted outside the LTIP’s first year share availability pool, are fully vested, and will be released to the employees and directors in three tranches at the rate of 33.4%, 33.3% and 33.3% on September 1, 2018, March 1, 2019 and September 1, 2019, respectively. In the event an employee voluntarily resigns, the release dates of the shares will be extended such that only 16.5% of the shares are released every nine months, until 100% are released. In the event that a director voluntarily resigns, each of the release dates will be extended nine months. The LTIP and January 2018 Restricted Stock Grant were approved by a majority of the Company’s stockholders on January 31, 2018. In connection with the January 2018 Restricted Stock Grant, the Company recorded stock-based compensation expense of $2,156,000 for the three and six months ended June 30, 2018. On March 1, 2019, the Company released its second tranche of restricted shares under the January 2018 Restricted Stock Grant. The majority of the restricted stock that was released were net-share settled such that the Company withheld shares with value equivalent to the employees’ minimum statutory obligation for the applicable income and other employment taxes, and remitted the cash to the appropriate taxing authorities. The total shares withheld were based on the value of the restricted stock on their release date as determined by our closing stock price. These net-share settlements had the effect of share repurchases as they reduced and retired the number of shares that would have otherwise been issued as a result of the release and did not represent an expense to us. For the three months ended March 31, 2019, 471,697 shares of restricted stock were released with an intrinsic value of approximately $1.0 million. Of the restricted stock released, 323,162 shares were forfeited and we withheld 24,687 shares to satisfy approximately $65,000 of employees’ minimum tax obligation on the released restricted stock. As of June 30, 2019, there were 492,808 shares of restricted stock remaining under the January 2018 Restricted Stock Grant, 464,632 of such shares were to be released on September 1, 2019, with an additional 28,176 shares to be released to a terminated employee in four equal tranches over the next 20 months. On February 28, 2018, in connection with the extension of the maturity date of the Series C Convertible Note to August 28, 2018, the Company issued 327 shares of its common stock to the note holder. The Company recorded nominal interest expense for the three and six months ended June 30, 2018. On January 4, 2019, the Company awarded 400,000 deferred shares to Michael Howse, a member of the Company’s Board of Directors, in connection with a Deferred Shares Agreement under the LTIP. The shares vest immediately prior to a significant change in ownership, defined as a Fundamental Transaction in the agreement. In light of this performance vesting condition, the Company has not recorded any stock compensation expense for the issuance of these shares during the three and six months ended June 30, 2019. During the three months ended June 30, 2019, the Company issued 161,530 common shares to vendors in exchange for services. Warrants for Common Shares The Company has issued warrants to purchase common shares to employees and consultants as compensation for services rendered, as well as, in conjunction with the purchase of common shares in equity and debt transactions. A summary of the warrant activity and related information that occurred for the six months ended June 30, 2019 and 2018 is provided in the following paragraphs. In connection with the Series F Convertible Notes issued during the three months ended June 30, 2018, the Company issued warrants to purchase 25,000 common shares at an exercise price of $5.40 per share with a five-year term. The grant date fair value of the warrants was $44,000 which was recorded as debt discount with the offset recorded to additional paid-in capital on the consolidated balance sheet. The fair value of the warrants was determined using the Black-Scholes Model based on the following weighted average assumptions: common share price on date of grant $4.03, expected dividend yield 0%, expected volatility 57%, risk-free interest rate 2.82% and expected life of 5 years. In connection with the Series F Convertible Notes issued during the three months ended June 30, 2018, the Company issued warrants to investment bankers to purchase 3,222 common shares at an exercise price of $5.40 per share with a five-year term. The grant date fair value of the warrants was $5,700 which was recorded as debt discount with the offset recorded to additional paid-in capital on the consolidated balance sheet. The fair value of the warrants was determined using the Black-Scholes Model based on the following weighted average assumptions: common share price on date of grant $4.03, expected dividend yield 0%, expected volatility 57%, risk-free interest rate 2.82% and expected life of 5 years. In connection with the Series G Notes issued during the three months ended June 30, 2018, the Company issued warrants to purchase 208,350 common shares at an exercise price of $5.40 per share with a five-year term. The grant date fair value of the warrants was $366,000 which was recorded as debt discount with the offset recorded to additional paid-in capital on the consolidated balance sheet. The fair value of the warrants was determined using the Black-Scholes Model based on the following weighted average assumptions: common share price on date of grant $4.03, expected dividend yield 0%, expected volatility 57%, risk-free interest rate 2.81% and expected life of 5 years. In connection with the Series G Notes issued during the three months ended June 30, 2018, the Company issued warrants to investment bankers to purchase 58,334 common shares at an exercise price of $5.40 per share with a five-year term. The grant date fair value of the warrants was $102,000 which was recorded as debt discount with the offset recorded to additional paid-in capital on the consolidated balance sheet. The fair value of the warrants was determined using the Black-Scholes Model based on the following weighted average assumptions: common share price on date of grant $4.03, expected dividend yield 0%, expected volatility 57%, risk-free interest rate 2.82% and expected life of 5 years. In April 2018, the Company granted warrants to purchase up to 275,000 shares of common stock to Michael Howse, a member of the Company’s Board of Directors in connection with a consulting agreement. The warrants have an exercise price of $5.40 per share and warrants to purchase up to 110,000 shares of common stock vest over nine months. The remaining warrants vest upon certain performance milestones. As of June 30, 2019, warrants to purchase 110,000 shares of common stock were vested. All of the warrants immediately vest upon a change of control, and the exercise price is subject to certain price protection provisions. The fair value of the warrants that vested in the three and six months ended June 30, 2019 was $0 and $4,000 respectively, which was recorded as consulting expense with the offset recorded to warrant liability. The fair value of the warrants was estimated using the Black-Scholes Model based on the following weighted average assumptions: common share price on date of grant $1.66, expected dividend yield 0%, expected volatility 59%, risk-free interest rate 1.74% and expected life of 3.77 years. In April 2019, the Company granted warrants to purchase up to 225,102 shares of common stock to Ms. Walsh, holder of Series A Preferred Stock. The warrants have an exercise price of $1.98 per share and are fully vested. The fair value of the warrants at issuance was $216,000. The fair value of the warrants was estimated using the Black-Scholes Model based on the following weighted average assumptions: common share price on date of grant $2.08, expected dividend yield 0%, expected volatility 59%, risk-free interest rate 2.38% and expected life of 5.0 years. The Company determined the relative fair value of the warrant and the related Series A Preferred Stock, and recorded the warrant at $200,000, with the offset recorded to additional paid-in capital. In April 2019, the Company granted warrants to purchase up to 40,816 shares of common stock to Alexander Capital, L.P. in connection with the issuance of the Series A Preferred Stock. The warrants have an exercise price of $2.18 per share and are fully vested but not exercisable until October 2019. The fair value of the warrants at issuance was $43,000. The fair value of the warrants was estimated using the Black-Scholes Model based on the following weighted average assumptions: common share price on date of grant $2.08, expected dividend yield 0%, expected volatility 59%, risk-free interest rate 2.38% and expected life of 5.0 years. The fair value was recorded as a cost of issuance of the Series A Preferred Stock, with the offset to additional paid-in capital. In May 2019, the Company granted warrants to purchase up to 122,272 shares of common stock to Alexander Capital, L.P. in connection with the Public Offering. The warrants have an exercise price of $1.66 per share and are fully vested but not exercisable until May 2020. The fair value of the warrants at issuance was $70,000. The fair value of the warrants was estimated using the Black-Scholes Model based on the following weighted average assumptions: common share price on date of grant $1.36, expected dividend yield 0%, expected volatility 60%, risk-free interest rate 2.18% and expected life of 4.0 years. The fair value was recorded as a cost of issuance of the common stock, with the offset to additional paid-in capital. Information regarding warrants for common stock outstanding and exercisable as of June 30, 2019 is as follows: Warrants Warrants Exercise Outstanding as of Remaining Exercisable as of Price June 30, 2019 Life (years) June 30, 2019 $1.66 - $2.18 693,190 4.41 365,102 $3.00 - $4.00 5,522,720 3.72 5,522,720 $4.50 - $4.95 298,882 1.90 298,882 $5.40 - $6.25 2,543,577 3.08 2,543,577 $10.35 1,634 1.79 1,634 $3.69 9,060,003 3.53 8,731,915 Warrants exercisable as of June 30, 2019 excludes warrants to purchase 165,000 common shares issued to Mr. Howse which have not yet vested.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Taxes
Income Taxes	8. Income Taxes The Company recorded a provision for income taxes of $7,000 for the six months ended June 30, 2019 and $2,000 for the six months ended June 30, 2018. The provision for income taxes recorded for the six months both 2019 and 2018 was primarily due to state income tax expense. The Company’s effective tax rate was (0.04)% for the six months ended June 30, 2019 and (0.13)% for the six months ended June 30, 2018. The difference between the effective tax rate and the federal statutory tax rate for the six months ended June 30, 2019 and 2018 primarily relates to the valuation allowance on the Company’s deferred tax assets. For interim periods, the Company estimates its annual effective income tax rate and applies the estimated rate to the year-to-date income or loss before income taxes. The Company also computes the tax provision or benefit related to items reported separately and recognizes the items net of their related tax effect in the interim periods in which they occur. The Company also recognizes the effect of changes in enacted tax laws or rates in the interim periods in which the changes occur. As of June 30, 2019, the Company retains a full valuation allowance on its deferred tax assets. The realization of the Company’s deferred tax assets depends primarily on its ability to generate taxable income in future periods. The amount of deferred tax assets considered realizable in future periods may change as management continues to reassess the underlying factors it uses in estimating future taxable income. The provision for income taxes for the six months ended June 30, 2019 and 2018 was calculated on a jurisdiction basis.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies
Commitments and Contingencies	9. Commitments and Contingencies Operating Leases The Company rents its Beaverton, Oregon office under an operating lease, which was set to expire in October 2018. In July 2018, the Company extended its lease through October 31, 2020. Under the terms of the lease, the Company is responsible for taxes, insurance and maintenance expense. The Company recognizes rent expense on a straight-line basis over the lease period. Rent expense for the three months ended June 30, 2019 and 2018 was $99,000 and $91,000, respectively. Rent expense for the six months ended June 30, 2019 and 2018 was $189,000 and $179,000, respectively. Future annual minimum lease payments under the non-cancelable operating lease as of June 30, 2019 are $179,000 and $304,000, respectively, for the years ending December 31, 2019 and 2020. Contingencies In the normal course of business, the Company may become involved in legal proceedings. The Company will accrue a liability for such matters when it is probable that a liability has been incurred and the amount can be reasonably estimated. When only a range of a possible loss can be established, the most probable amount in the range is accrued. If no amount within this range is a better estimate than any other amount within the range, the minimum amount in the range is accrued. The accrual for a litigation loss contingency might include, for example, estimates of potential damages, outside legal fees and other directly related costs expected to be incurred. The Company’s management does not believe that any such matters, individually or in the aggregate, will have a materially adverse effect on the Company’s condensed consolidated financial statements.

Related Parties

Related Parties	6 Months Ended
	Jun. 30, 2019
Related Parties
Related Parties	10. Related Parties Brett Moyer Mr. Moyer has served as the Company’s President, Chief Executive Officer and a board member since the Company’s founding in August 2010. Effective February 28, 2018, Mr. Moyer agreed to extend the maturity date of his Series D Convertible Note to June 30, 2018, which was later amended to extend the maturity date to July 25, 2018. In connection with the maturity date extension, Mr. Moyer received a warrant to purchase 9,058 shares of common stock at an exercise price of $5.40 and which accrued an additional 10% interest on the first day of every month, beginning March 1, 2018, so long as such Series D Convertible Note remains outstanding. In April 2018, the Company issued Mr. Moyer a $63,000 Series G Note, initially due June 15, 2018, in consideration for $50,000 of expenses incurred by Mr. Moyer. In June 2018, in consideration for extending the maturity date of the Series G Note to July 15, 2018, Mr. Moyer was granted a warrant to purchase 4,630 shares of common stock at an exercise price equal to the lesser of (i) $4.50 or (ii) the price per share of common stock sold in the Company’s IPO, multiplied by 60%. In July 2018, in consideration for the extension of the Series G Note maturity date to July 25, 2018 and the agreement to make the Series G Note automatically convertible, Mr. Moyer was granted a warrant to purchase 13,889 shares of common stock at an exercise price equal to the lesser of (i) $4.50 or (ii) the price per share of common stock sold in the Company’s IPO, multiplied by 60%. On July 25, 2018, in connection with the Company’s IPO, $537,000 of principal under convertible promissory notes, and all accrued interest, was automatically converted into a total of 157,881 shares of common stock and the warrants issued in connection with the Series G Notes now have an exercise price of $3.60. As of June 30, 2019 and December 31, 2018, Mr. Moyer was owed $0 of principal under convertible promissory notes and owned 1.2% and 1.5% of the outstanding shares of the Company’s common stock respectively. Michael Fazio Mr. Fazio is the chairman of MARCorp Financial LLC, a private equity firm located in Illinois. Mr. Fazio served as a member of the Company’s board of directors beginning May 2017. On May 17, 2017, the Company entered into a securities purchase agreement with MARCorp Signal, LLC, pursuant to which the Company borrowed a total of $5,000,000 from MARCorp Signal, LLC in consideration for the Series E Convertible Note. MARCorp Signal, LLC is a wholly-owned subsidiary of MARCorp Financial LLC. In connection with such borrowings, MARCorp Signal, LLC was issued a warrant to purchase 2,614,381 of the Company’s common units, which warrant was exercisable at $4.50 per unit and had a five-year life. On November 30, 2017, MARCorp Signal, LLC’s Series E Convertible Note was repaid by the Company in full. Pursuant to a settlement agreement that the Company entered into with MARCorp Signal, LLC on July 25, 2018, a warrant to purchase an aggregate of 487,864 shares of common stock was issued to MARCorp Signal, LLC, and following the Company’s IPO, the exercise price of the warrants issued in connection with the Series E Convertible Note became $3.00. On June 19, 2019, Mr. Fazio notified the Company of his decision to resign from the Company's board of directors effective June 19, 2019. Mr. Fazio resigned to focus on managing MARCorp Financial LLC and not due to any disagreement between the Company and Mr. Fazio, or any matter related to the Company s operations, policies or practices. As of June 30, 2019 and December 31, 2018, Mr. Fazio was owed $0 of principal under convertible promissory notes and owned less than 1% of the outstanding shares of the Company’s common stock. Jonathan Gazdak Mr. Gazdak is Managing Director – Head of Investment Banking for Alexander Capital, L.P., an investment banking firm based in New York. Mr. Gazdak has been a member of the Company’s board of directors since September 2015. Alexander Capital, L.P. has acted as the lead investment bank in a number of the Company’s private financings. Effective February 28, 2018, Mr. Gazdak agreed to extend the maturity date of his Series D Convertible Note to June 30, 2018, which was later amended to extend the maturity date to July 25, 2018. In connection with the maturity date extension, Mr. Gazdak received a warrant to purchase 1,569 shares of common stock at an exercise price of $5.40 and which will accrue an additional 10% interest on the first day of every month, beginning March 1, 2018, so long as such Series D Convertible Note remains outstanding. On July 25, 2018, in connection with the Company’s IPO, $21,000 of principal under convertible promissory notes, and all accrued interest, were automatically converted into a total of 5,647 shares of common stock. As of June 30, 2019 and December 31, 2018, Mr. Gazdak was owed $0 of principal under convertible promissory notes and owned less than 1% of the outstanding shares of the Company. The Company signed an engagement letter with Alexander Capital, L.P. in August of 2014 ("August 2014 Engagement Letter"), under which Alexander Capital, L.P. earned a fee on total investments by their clients. Alexander Capital, L.P. earned fees of $200,250 and $321,300 for the three and six months ended June 30, 2018, under the August 2014 Engagement Letter. As of June 30, 2019, Alexander Capital, L.P. has been issued warrants to purchase a total of 588,391 shares of common stock, exercisable at prices between $3.30 and $5.40 per share and for five years from the date of issuance, under the August 2014 Engagement Letter. The August 2014 Engagement Letter was terminated upon the completion of the IPO. Pursuant to the underwriting agreement entered into between the Company and Alexander Capital, L.P. in connection with the IPO (the “Underwriting Agreement”), Alexander Capital, L.P. was paid a cash fee of $900,000, as well as a non-accountable expense allowance of $120,000 and reimbursements of $100,000. Pursuant to the Underwriting Agreement, we issued Alexander Capital, L.P. warrants to purchase 72,000 shares of common stock. Such warrants are fully vested, exercisable at a per share price of $6.25 and are exercisable at any time during the five-year period commencing 180 days from the effective date of the IPO, which period shall not exceed five years from such effective date. The Company signed an engagement letter with Alexander Capital, L.P. in April of 2019 ("April 2019 Engagement Letter"), under which Alexander Capital, L.P. earns a fee on total investments by their clients. Alexander Capital, L.P. earned fees of $80,000 for both the three and six months ended June 30, 2019, under the April 2019 Engagement Letter. As of June 30, 2019, Alexander Capital, L.P. has been issued warrants to purchase a total of 40,816 shares of common stock at an exercise price of $2.18 per share, under the April 2019 Engagement Letter. The warrant is fully vested and exercisable after October 18, 2019 through April 18, 2024. Pursuant to the underwriting agreement entered into between the Company and Alexander Capital, L.P. in connection with the Public Offering (the "Public Offering Underwriting Agreement"), Alexander Capital, L.P. was paid a cash fee of $406,554, as well as a non-accountable expense allowance of $54,207 and reimbursements of $100,000. Pursuant to the Underwriting Agreement, we issued Alexander Capital, L.P. warrants to purchase 122,272 shares of common stock. Such warrants are fully vested, exercisable at a per share price of $1.66 and are exercisable at any time during the five-year period commencing 365 days from the effective date of the Public Offering, which period shall not exceed five years from such effective date. Brian Herr Mr. Herr has been a member of the Company’s board of directors since February 2018. Mr. Herr is Chief Investment Officer and Co-Head of Structured Credit and Asset Finance for the Medalist Partners platform (f/k/a Candlewood Structured Strategy Funds) and serves as a co-portfolio manager for the Medalist Partners Harvest Master Fund, Ltd. and Medalist Partners Opportunity Master Fund A, LP (collectively, the “Medalist Funds”). Mr. Herr was granted a seat on the Company’s board of directors pursuant to a securities purchase agreement, dated as of November 30, 2017, between the Company and the Medalist Funds, pursuant to which the Company also issued to the Medalist Funds an aggregate of $2,000,000 Series F Convertible Notes, due June 30, 2018, which was later amended to extend the maturity date to July 25, 2018, and warrants to purchase an aggregate of 222,222 shares of our common stock. In addition, between April 20, 2018 and June 29, 2018, the Company issued an aggregate of $2,438,000 of Series G Notes due July 15, 2018, as amended to the Medalist Funds and warrants to purchase an aggregate of 180,570 shares of our common stock. In July 2018, in consideration for the extension of the Series G Note maturity date to July 25, 2018 and the agreement to make the Series G Note automatically convertible, the Medalist Funds were granted a warrant to purchase 541,666 shares of common stock at an exercise price equal to the lesser of (i) $4.50 or (ii) the price per share of common stock sold in the Company’s IPO, multiplied by 60%. On July 25, 2018, in connection with the Company’s IPO, $3,950,000 of principal under convertible promissory notes, and all accrued interest, were automatically converted into a total of 1,950,348 shares of common stock and the warrants issued in connection with the Series G Notes now have an exercise price of $3.00. As of June 30, 2019 and December 31, 2018, the Medalist Funds were owed $0 of principal under convertible promissory notes and owned 10.0% and 12.7% of the outstanding shares of the Company, respectively. Michael Howse We are party to an agreement with Michael Howse, dated April 6, 2018, as amended effective as of December 27, 2018 (the “Howse Agreement”), pursuant to which Mr. Howse was appointed interim role as chief strategy officer on an “at-will” basis in consideration for a monthly cash salary as well as (i) a warrant to purchase 110,000 shares of our common stock, exercisable at a per share price of $2.00 and which vested monthly over a nine-month period and which fully vested on January 6, 2019 and (ii) a warrant to purchase 165,000 shares of our common stock, exercisable at a per share price of $2.00, which shall vest, so long as Mr. Howse continues to serve as interim chief strategy officer and/or as a member of our board of directors, (x) as to 110,000 shares of common stock upon the achievement of a significant milestone and (y) as to 65,000 shares of common stock upon the achievement of an additional significant milestone. The foregoing exercise prices are subject to adjustment as provided in each warrant. Pursuant to the Howse Agreement, such warrants shall fully vest on the earlier of (1) immediately prior to a Fundamental Transaction, as defined in such agreement, and (2) Mr. Howse’s removal from our board of directors for any reason other than his resignation, his intentional illegal conduct or gross misconduct, or his conviction for any felony, theft, embezzlement or violent crime. In addition, pursuant to the Howse Agreement, we also agreed to appoint Mr. Howse to our board of directors, where he may only be removed for cause, or his termination or resignation. Under the Howse Agreement, if the Company raises capital in one or more financings from certain pre-approved strategic investors, or is acquired by a third-party during the period that Mr. Howse serves as interim chief strategy officer (or within six months thereafter), he will receive a percentage cash bonus concurrently with the closing of such transaction based on the amount raised or consideration paid for the Company, as applicable, (A) which bonus doubles in the event that the Company does not incur an amount equal to 2% or more of the consideration (as defined in the Howse Agreement) in fees to any investment bank in connection with such transaction, if such transaction is a Fundamental Transaction, and (B) 50% of which bonus may be paid as a convertible note or preferred equity with the same terms as the other participants in such transaction, if such transaction is a financing. Pursuant to the Howse Agreement, we may terminate Mr. Howse at any time, with or without cause, upon 90 days’ prior written notice. Such agreement provides for Company-sponsored benefits in accordance with our policies. Pursuant to the Howse Agreement, effective November 1, 2018, Mr. Howse was placed on our payroll and is now considered a part-time Company employee. In connection with the Howse Agreement, the Company is also party to the Deferred Shares Agreement, entered into as January 4, 2019 (the “Deferred Shares Agreement”), pursuant to which the Company granted Mr. Howse up to 400,000 deferred shares under the LTIP (the “Deferred Shares”). Pursuant to such agreement, if a Fundamental Transaction has not occurred within 180 days of the earlier of the date on which Mr. Howse no longer serves (i) as our interim chief strategy officer or (ii) on our board of directors, all of the Deferred Shares shall be forfeited and Mr. Howse will have no further rights to such shares. Pursuant to such agreement, the Deferred Shares shall vest immediately prior to a Fundamental Transaction, and the number of Deferred Shares that shall vest is based on the consideration paid for the Company in such transaction, which number of Deferred Shares that shall vest to double in the event that the Company does not incur general expenses (as defined). As of June 30, 2019, Mr. Howse has vested warrants to purchase 110,000 shares of common stock and owns 0% of the outstanding shares of the Company. Helge Kristensen Mr. Kristensen has served as a member of the Company’s board of directors since 2010. Mr. Kristensen serves as vice president of Hansong Technology, an original device manufacturer of audio products based in China, president of Platin Gate Technology (Nanjing) Co. Ltd, a company with focus on service-branding in lifestyle products as well as pro line products based in China and co-founder and director of Inizio Capital, an investment company based in the Cayman Islands. Effective February 28, 2018, Inizio Capital and Hansong Technology agreed to extend the maturity dates of the Five February 2016 Note and the December 2015 Note, respectively to June 30, 2018, which was later amended to extend the maturity date to July 25, 2018. In connection with the maturity date extensions, Inizio Capital and Hansong Technology received warrants to purchase 1,341 and 942 shares of common stock, respectively, at an exercise price of $5.40. On July 25, 2018, in connection with the Company’s IPO, $50,000 of principal under convertible promissory notes, and all accrued interest, were automatically converted into a total of 27,923 shares of common stock. As of June 30, 2019 and December 31, 2018, affiliates of Mr. Kristensen were owed $0 of principal under convertible promissory notes and owned less than 1.0% of the outstanding shares of the Company. Significant Shareholders In January 2017, Carl E. Berg invested the aggregate sum of $300,000 in the Company’s Series D Convertible Note financing described in Note 5 of the Notes to the Consolidated Financial Statements and was granted a warrant to purchase 39,216 shares of common stock at an exercise price of $5.40. Effective February 28, 2018, Mr. Berg agreed to extend the maturity date of his Series D Convertible Note to June 30, 2018, which was later amended to extend the maturity date to July 25, 2018. In connection with the maturity date extension, Mr. Berg received a warrant to purchase 39,216 shares of common stock at an exercise price of $5.40 and will accrue an additional 10% interest on the first day of every month, beginning March 1, 2018, so long as such Series D Convertible Note remains outstanding. In addition, Mr. Berg agreed to extend the maturity date of his various other convertibles notes to June 30, 2018, which was later amended to extend the maturity date to July 25, 2018. In connection with the maturity date extensions, Mr. Berg received warrants to purchase a total of 25,965 shares of common stock at an exercise price of $5.40. On July 25, 2018, in connection with the Company’s IPO, $1,479,000 of principal under convertible promissory notes, and all accrued interest, were automatically converted into a total of 464,687 shares of common stock. As of June 30, 2019 and December 31, 2018, Mr. Berg was owed $0 of principal under convertible promissory notes and owned 8.1% and 10.4% of the outstanding shares of the Company, respectively. In November 2017, Lisa Walsh invested $6,500,000 in the Company’s Series F Convertible Note financing and was issued warrants to purchase 722,222 shares of common stock at an exercise price of $5.40 per share. Effective February 28, 2018, Ms. Walsh agreed to extend the maturity date of her Series D Convertible Note to June 30, 2018, which was later amended to extend the maturity date to July 25, 2018. In connection with the maturity date extension, Ms. Walsh received a warrant to purchase 112,419 shares of common stock at an exercise price of $5.40 and which will accrue an additional 10% interest on the first day of every month, beginning March 1, 2018, so long as such Series D Convertible Note remains outstanding. In May 2018, the Company issued Ms. Walsh a $288,000 Series G Note, initially due June 15, 2018. In June 2018, in consideration for extending the maturity date of the Series G Note to July 15, 2018, Ms. Walsh was granted a warrant to purchase 23,150 shares of common stock at an exercise price equal to the lesser of (i) $4.50 or (ii) the price per share of common stock sold in the Company’s IPO, multiplied by 60%. In July 2018, in consideration for the extension of the Series G Note maturity date to July 25, 2018 and the agreement to make the Series G Note automatically convertible, Ms. Walsh was granted a warrant to purchase 69,444 shares of common stock at an exercise price equal to the lesser of (i) $4.50 or (ii) the price per share of common stock sold in the Company’s IPO, multiplied by 60%. On July 25, 2018, in connection with the Company’s IPO, $8,330,000 of principal under convertible promissory notes, and all accrued interest, were automatically converted into a total of 2,938,650 shares of common stock and the warrants issued in connection with the Series G Notes now have an exercise price of $3.00. On April 18, 2019, Ms. Walsh agreed to purchase 250,000 shares of our Series A Preferred Stock in consideration for $1,000,000. Ms. Walsh was granted a warrant to purchase 255,102 shares of our common stock at an exercise price of $1.98 per share. As of June 30, 2019 and December 31, 2018, Ms. Walsh was owed $0 of principal under convertible promissory notes and owned 20.7% and 26.4% of the outstanding shares of the Company, respectively.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2019
Segment Information
Segment Information	11. Segment Information The Company operates in one business segment, wireless audio products. Our chief decision-maker, the President and Chief Executive Officer, evaluates our performance based on company-wide consolidated results. Net revenue from customers is designated based on the geographic region to which the product is delivered. Net revenue by geographic region for the three and six months ended June 30, 2019 and 2018 was as follows: (in thousands) For the three months ended For the six months ended June 30, June 30, 2019 2018 2019 2018 United States $ — $ 2 $ 3 $ 2 Europe 138 98 287 176 Asia Pacific 214 280 527 484 Total $ 352 $ 380 $ 817 $ 662 Substantially all of our long-lived assets are located in the United States.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Summary of Significant Accounting Policies
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and pursuant to Article 10 of Regulation S-X of the Securities Act of 1933, as amended (“Securities Act”). Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. These unaudited condensed consolidated financial statements include all normal and recurring adjustments that the Company believes are necessary to fairly state the Company’s financial position and the results of operations and cash flows. Interim period results are not necessarily indicative of results of operations or cash flows for a full year or any subsequent interim period. The condensed consolidated balance sheet as of December 31, 2018 has been derived from audited consolidated financial statements at that date, but does not include all disclosures required by U.S. GAAP for complete financial statements.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Reclassification	Reclassification Certain reclassifications have been made to prior periods' financial statements to conform to the current period presentation. These reclassifications did not result in any change in previously reported net loss, total assets or shareholders' equity.
Concentration of Credit Risk and Other Risks and Uncertainties	Concentration of Credit Risk and Other Risks and Uncertainties Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. Cash and cash equivalents are deposited in demand and money market accounts at one financial institution. At times, such deposits may be in excess of insured limits. The Company has not experienced any losses on its deposits of cash and cash equivalents. The Company’s accounts receivable are derived from revenue earned from customers located throughout the world. The Company performs credit evaluations of its customers’ financial condition and sometimes requires partial payment in advance of shipping. As of June 30, 2019, the Company had two customers accounting for 84% and 15% of accounts receivable. As of December 31, 2018, the Company had two customers accounting for 47% and 42% of accounts receivable. The Company had three customers accounting for 38%, 38% and 15% of its net revenue for the three months ended June 30, 2019. The Company had three customers accounting for 53%, 34% and 6% of its net revenue for the six months ended June 30, 2019. The Company had three customers accounting for 60%, 25% and 11% of its net revenue for the three months ended June 30, 2018. The Company had two customers accounting for 63% and 25% of its net revenue for the six months ended June 30, 2018. The Company’s future results of operations involve a number of risks and uncertainties. Factors that could affect the Company’s future operating results and cause actual results to vary materially from expectations include, but are not limited to, rapid technological change, continued acceptance of the Company’s products, competition from substitute products and larger companies, protection of proprietary technology, strategic relationships and dependence on key individuals. The Company relies on sole-source suppliers to manufacture some of the components used in its product. The Company’s manufacturers and suppliers may encounter problems during manufacturing due to a variety of reasons, any of which could delay or impede their ability to meet demand. The Company is heavily dependent on a single contractor in China for assembly and testing of its products, a single contractor in Japan for the production of its transmit semiconductor chip and a single contractor in China for the production of its receive semiconductor chip.
Convertible Financial Instruments	Convertible Financial Instruments The Company bifurcates conversion options and warrants from their host instruments and accounts for them as freestanding derivative financial instruments if certain criteria are met. The criteria include circumstances in which (a) the economic characteristics and risks of the embedded derivative instrument are not clearly and closely related to the economic characteristics and risks of the host contract, (b) the hybrid instrument that embodies both the embedded derivative instrument and the host contract is not re-measured at fair value under otherwise applicable generally accepted accounting principles with changes in fair value reported in earnings as they occur and (c) a separate instrument with the same terms as the embedded derivative instrument would be considered a derivative instrument. An exception to this rule is when the host instrument is deemed to be conventional, as that term is described under applicable U.S. GAAP. When the Company has determined that the embedded conversion options and warrants should be bifurcated from their host instruments, discounts are recorded for the intrinsic value of conversion options embedded in the instruments based upon the differences between the fair value of the underlying common stock at the commitment date of the transaction and the effective conversion price embedded in the instrument. Debt discounts under these arrangements are amortized to interest expense using the interest method over the earlier of the term of the related debt or their earliest date of redemption.
Warrants for Common Shares and Derivative Financial Instruments	Warrants for Common Shares and Derivative Financial Instruments Warrants for common shares and other derivative financial instruments are classified as equity if the contracts (1) require physical settlement or net-share settlement or (2) give the Company a choice of net-cash settlement or settlement in its own shares (physical settlement or net-share settlement). Contracts which (1) require net-cash settlement (including a requirement to net cash settle the contract if an event occurs and if that event is outside the control of the Company), (2) give the counterparty a choice of net-cash settlement or settlement in shares (physical settlement or net-share settlement), or (3) that contain reset provisions that do not qualify for the scope exception are classified as equity or liabilities. The Company assesses classification of its warrants for common shares and other derivatives at each reporting date to determine whether a change in classification between equity and liabilities is required. The issuance of the convertible notes payable generated a beneficial conversion feature (“BCF”), which arises when a debt or equity security is issued with an embedded conversion option that is beneficial to the investor or in the money at inception because the conversion option has an effective strike price that is less than the market price of the underlying stock at the commitment date. The Company recognized the BCF by allocating the intrinsic value of the conversion option, which is the number of shares of common stock available upon conversion multiplied by the difference between the effective conversion price per share and the fair value of common stock per share on the commitment date, to common shares, resulting in a discount on the convertible debt.
Revenue Recognition	Revenue Recognition Revenue is recognized when control of the promised goods or services is transferred to customers, in an amount that reflects the consideration that we expect to be entitled to in exchange for those goods or services. Sales of products with alternative uses account for the majority of our revenue and are recognized at a point in time. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by us from a customer and deposited with the relevant government authority, are excluded from revenue. Our revenue arrangements do not contain significant financing components. Sales to certain distributors are made under arrangements which provide the distributors with price adjustments, price protection, stock rotation and other allowances under certain circumstances. The Company does not provide its customers with a contractual right of return. However, the Company accepts limited returns on a case-by-case basis. These returns, adjustments and other allowances are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenue recognized. We believe that there will not be significant changes to our estimates of variable consideration. If a customer pays consideration, or the Company has a right to an amount of consideration that is unconditional before we transfer a good or service to the customer, those amounts are classified as deferred income/advances received from customers which are included in other current liabilities when the payment is made or it is due, whichever is earlier.
Comprehensive Loss	Comprehensive Loss Comprehensive loss includes all changes within stockholders’ equity that are not the result of transactions with stockholders. Accumulated other comprehensive loss includes the foreign currency translation adjustments arising from the consolidation of the Company’s foreign subsidiary.
Foreign Currency	Foreign Currency The financial position and results of operations of the Company’s foreign operations are measured using currencies other than the U.S. dollar as their functional currencies. Accordingly, for these operations all assets and liabilities are translated into U.S. dollars at the current exchange rates as of the respective balance sheet date. Expense items are translated using the weighted average exchange rates prevailing during the period. Cumulative gains and losses from the translation of these operations’ financial statements are reported as a separate component of stockholders’ equity, while foreign currency transaction gains or losses, resulting from remeasuring local currency to the U.S. dollar are recorded in the condensed consolidated statement of operations in other income (expense), net and were not material for the three and six months ended June 30, 2019 and 2018.
Advertising Costs	Advertising Costs Advertising costs are charged to sales and marketing expenses as incurred. Advertising costs for the three and six months ended June 30, 2019 and 2018 were not material.
Net Loss per Common Share	Net Loss per Common Share Basic net loss per common share is calculated by dividing the net loss attributable to common stockholders by the weighted average number of common shares outstanding during the period, without consideration for potentially dilutive securities. Diluted net loss per common share is computed by dividing the net loss attributable to common stockholders by the weighted average number of common shares and potentially dilutive common share equivalents outstanding for the period determined using the treasury-stock and if-converted methods. For purposes of the diluted net loss per common share calculation, preferred stock, warrants for common stock, restricted stock units and shares issuable upon the conversion of convertible notes payable are considered to be potentially dilutive securities. For the three and six months ended June 30, 2019, warrants to purchase 9,060,003 shares of common stock, 250,000 shares of preferred stock and 492,808 shares of restricted stock have been excluded from the calculation of net loss per common share because the inclusion would be antidilutive. For the three and six months ended June 30, 2018, warrants to purchase 7,366,944 shares of common stock, 2,762,594 shares of preferred stock, and 1,437,596 shares of restricted stock have been excluded from the calculation of net loss per common share because the inclusion would be antidilutive. In addition, shares issuable upon the conversion of convertible notes payable have been excluded from the calculation of net loss per common share for all periods presented because the inclusion would be antidilutive.
Recently Issued and Adopted Accounting Pronouncements	Recently Issued and Adopted Accounting Pronouncements In June 2018, the Financial Accounting Standards Board (“FASB”) issued an Accounting Standards Update (“ASU”) No. 2018‑07, “Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting”. ASU 2018‑07 applies to all entities that enter into share-based payment transactions for acquiring goods and services from nonemployees. The amendments in ASU 2018‑07 expand the scope of Topic 718, Compensation - Stock Compensation, to include share-based payments transactions to nonemployees. Changes to the accounting for nonemployee awards as a result of ASU 2018‑07 include: 1) equity-classified nonemployee share-based payment awards are measured at the grant date, instead of the previous requirement to remeasure the awards through the performance completion date, 2) for awards with performance conditions, compensation cost is recognized when the achievement of the performance condition is probable, rather than upon achievement, and 3) the current requirement to reassess the classification (equity or liability) for nonemployee awards upon vesting is eliminated. ASU 2018‑07 clarifies that Topic 718 does not apply to financing transactions or awards granted to customers as part of a contract accounted for under Topic 606, Revenue from Contracts with Customers. The amendments in ASU 2018‑07 are effective for public business entities for fiscal years beginning after December 15, 2018. The Company adopted this guidance as of January 1, 2019 and the adoption did not have a significant impact on the condensed consolidated financial statements.
Recently Issued and Not Yet Adopted Accounting Pronouncements	Recently Issued and Not Yet Adopted Accounting Pronouncements In February 2016, the FASB issued ASU 2016‑02, “Leases”. The objective of the update is to increase transparency and comparability among organizations by recognizing lease assets and liabilities on the balance sheet for leases with a lease term of more than 12 months. In addition, the update will require additional disclosures regarding key information about leasing arrangements. Under existing guidance, operating leases are not recorded as lease assets and lease liabilities on the balance sheet. As an emerging growth company, the Company is allowed to adopt accounting pronouncements at the same time as non-public business entities. As a result, we have elected to adopt the update for our fiscal year beginning after December 15, 2019. The Company does not expect the adoption of this standard to significantly impact the condensed consolidated financial statements. In August 2018, the FASB issued ASU 2018‑13, Fair Value Measurement (Topic 820). The FASB developed the amendments to Accounting Standards Codification 820 as part of its broader disclosure framework project, which aims to improve the effectiveness of disclosures in the notes to financial statements by focusing on requirements that clearly communicate the most important information to users of the financial statements. This update eliminates certain disclosure requirements for fair value measurements for all entities, requires public entities to disclose certain new information and modifies some of the existing disclosure requirements. The standard will be effective for fiscal years beginning after December 15, 2019, including interim periods within such fiscal years, with early adoption permitted. The Company is evaluating the impact of ASU 2018‑13 on its condensed consolidated financial statements. We have reviewed other recent accounting pronouncements and concluded they are either not applicable to the business, or no material effect is expected on the condensed consolidated financial statements as a result of future adoption.

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Jun. 30, 2019
Balance Sheet Components
Schedule of Inventories	Inventories (in thousands): June 30, December 31, 2019 2018 Work in progress $ 304 $ 191 Finished goods 1,778 1,192 Total inventories $ 2,082 $ 1,383
Schedule of Property, Plant and Equipment	Property and equipment, net (in thousands): June 30, December 31, 2019 2018 Machinery and equipment $ 771 $ 746 Tooling 7 7 Computer software 89 89 Furniture and fixtures 15 15 Leasehold improvements 11 11 893 868 Less: Accumulated depreciation and amortization (786) (758) Property and equipment, net $ 107 $ 110
Schedule of Accrued Liabilities	Accrued liabilities (in thousands): June 30, December 31, 2019 2018 Accrued vacation $ 261 $ 238 Accrued compensation — 17 Accrued bonus — 158 Customer advances 131 186 Accrued other 368 247 Total accrued liabilities $ 760 $ 846

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
Schedule of Company's financial assets and liabilities that are measured at fair value on a recurring basis	The Company’s financial assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 by level within the fair value hierarchy, are as follows: (in thousands) June 30, 2019 Significant Quoted prices other Significant in active observable unobservable markets inputs inputs (Level 1) (Level 2) (Level 3) Liabilities: Derivative liability $ — $ — $ 387 Warrant liability $ — $ — $ 39 (in thousands) December 31, 2018 Significant Quoted prices other Significant in active observable unobservable markets inputs inputs (Level 1) (Level 2) (Level 3) Liabilities: Warrant liability $ — $ — $ 210
Schedule of changes in fair value of the Company's warrant liability and derivative liability measured at fair value using significant unobservable inputs (Level 3)	The following table includes a summary of changes in fair value of the Company’s derivative liability measured at fair value using significant unobservable inputs (Level 3) for the three and six months ended June 30, 2019 and June 30, 2018: (in thousands) For the three months ended For the six months ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Beginning balance $ — $ 22,959 $ — $ 20,832 Additions 216 245 216 1,558 Change in fair value 171 2,572 171 3,386 Ending balance $ 387 $ 25,776 $ 387 $ 25,776
Warrant [Member]
Schedule of changes in fair value of the Company's warrant liability and derivative liability measured at fair value using significant unobservable inputs (Level 3)	The following table includes a summary of changes in fair value of the Company’s warrant liability measured at fair value using significant unobservable inputs (Level 3) for the three and six months ended June 30, 2019 and 2018: For the three months ended For the six months ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Beginning balance $ 103 927 $ 210 1,228 Additions — 65 4 65 Change in fair value (64) 4,358 (175) 4,249 Reclass to additional paid-in capital — — — (192) Ending balance $ 39 $ 5,350 $ 39 $ 5,350
Schedule of the weighted average significant unobservable inputs (Level 3 inputs) used in measuring the Company's warrant liability that is categorized within Level 3 of the fair value hierarchy	A summary of the weighted average significant unobservable inputs (Level 3 inputs) used in measuring the Company’s warrant liability that is categorized within Level 3 of the fair value hierarchy as of June 30, 2019 and December 31, 2018 is as follows: June 30, 2019 December 31, 2018 Common Stock Price $ 1.16 $ 3.42 Term (Years) 3.77 4.27 Volatility 59 % 58 % Risk-free rate of interest 1.74 % 2.58 % Dividend Yield 0.0 % 0.0 %

Preferred Stock and Stockhold_2

Preferred Stock and Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2019
Preferred Stock and Stockholders' Equity
Schedule of series A Preferred Stock and liquidation preferences	The authorized, issued and outstanding shares of Series A Preferred Stock and liquidation preferences as of June 30, 2019, were as follows: Number Proceeds Number of Shares Net of Conversion of Shares Issued and Issuance Price per Liquidation Authorized Outstanding Costs Share Preference Series A 8 % Senior Convertible Preferred Stock 250,000 $ 920,000 $ 4.00 $ 1,016,000
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range	Information regarding warrants for common stock outstanding and exercisable as of June 30, 2019 is as follows: Warrants Warrants Exercise Outstanding as of Remaining Exercisable as of Price June 30, 2019 Life (years) June 30, 2019 $1.66 - $2.18 693,190 4.41 365,102 $3.00 - $4.00 5,522,720 3.72 5,522,720 $4.50 - $4.95 298,882 1.90 298,882 $5.40 - $6.25 2,543,577 3.08 2,543,577 $10.35 1,634 1.79 1,634 $3.69 9,060,003 3.53 8,731,915

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Information
Schedule of net revenue by geographic region	Net revenue from customers is designated based on the geographic region to which the product is delivered. Net revenue by geographic region for the three and six months ended June 30, 2019 and 2018 was as follows: (in thousands) For the three months ended For the six months ended June 30, June 30, 2019 2018 2019 2018 United States $ — $ 2 $ 3 $ 2 Europe 138 98 287 176 Asia Pacific 214 280 527 484 Total $ 352 $ 380 $ 817 $ 662

Business and Viability of Ope_2

Business and Viability of Operations (Details)	May 24, 2019USD ($)$ / sharesshares	Apr. 18, 2019USD ($)$ / sharesshares	Jul. 26, 2018USD ($)$ / sharesshares	Jun. 30, 2019USD ($)$ / sharesshares	Jun. 30, 2019USD ($)$ / sharesshares	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)$ / sharesshares		Dec. 31, 2017shares	Jun. 15, 2018shares	Jul. 23, 2010shares
Stockholders' Equity, Reverse Stock Split									15-for-1
Preferred Stock, Shares Authorized | shares									20,000,000
Common Stock, Shares Authorized | shares				200,000,000	200,000,000		200,000,000		200,000,000
Common Stock, Shares, Issued | shares				19,727,431	19,727,431		15,366,327		324,821		4,872,221
Preferred Stock, Shares Issued | shares			2,762,594						2,762,594		41,438,818
Retained Earnings (Accumulated Deficit)				$ (181,029,000)	$ (181,029,000)		$ (175,640,000)	[1]
Cash and Cash Equivalents, at Carrying Value				3,322,000	3,322,000		$ 3,218,000	[1]
Proceeds from Issuance of Common Stock					$ 4,664,000	$ 0
Stock Issued During Period, Value, New Issues				$ 4,664,000
Convertible Preferred Stock, Shares Issued upon Conversion | shares			2,762,594
Debt Instrument, Convertible, Number of Equity Instruments			9,527,144
Repayments of Notes Payable			$ 200,000
Temporary Equity, Par or Stated Value Per Share | $ / shares				$ 0.0001	$ 0.0001		$ 0.0001
Temporary Equity, Dividend Rate, Percentage					8.00%		8.00%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares		255,102								208,350
Series A Preferred Stock [Member]
Shares, Issued | shares		250,000
Temporary Equity, Par Value Per Share | $ / shares		$ 0.0001
Temporary Equity, Stated Value Per Share | $ / shares		$ 4
Temporary Equity, Dividend Rate, Percentage		8.00%
Convertible Preferred Stock Conversion Price | $ / shares		$ 4		$ 4	$ 4
Convertible Preferred Stock Floor Price Per Share | $ / shares		$ 1.50
Proceeds from Issuance of Convertible Preferred Stock		$ 1,000,000		$ 920,000
Series A Preferred Stock [Member] | Minimum [Member]
Convertible Preferred Stock Conversion Price | $ / shares		$ 1.50
Proceeds from Issuance of Convertible Preferred Stock		$ 500,000
Series A Preferred Stock [Member] | Maximum [Member]
Proceeds from Issuance of Convertible Preferred Stock		$ 5,000,000
IPO [Member]
Shares Issued, Price Per Share | $ / shares	$ 1.33		$ 5
Proceeds from Issuance of Common Stock	$ 4,664,000		$ 10,273,000
Stock Issued During Period, Value, New Issues	$ 5,420,000		$ 12,000,000
Stock Issued During Period, Shares, New Issues | shares	4,075,726		2,400,000
Payments for Underwriters Discounts and Commissions			$ 900,000
Payments for Underwriters Accountable and Nonaccountable Expenses			220,000
Payments of Stock Issuance Costs			$ 607,000
[1]	The condensed consolidated balance sheet as of December 31, 2018 was derived from the audited consolidated balance sheet as of that date.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) - shares	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			9,060,003	7,366,944
Antidilutive Securities Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			250,000	2,762,594
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			492,808	1,437,596
Accounts Receivable [Member] | Customer Concentration Risk One [Member]
Concentration Risk, Percentage			84.00%		47.00%
Accounts Receivable [Member] | Customer Concentration Risk Two [Member]
Concentration Risk, Percentage			15.00%		42.00%
Sales Revenue, Net [Member] | Customer Concentration Risk One [Member]
Concentration Risk, Percentage	38.00%	60.00%	53.00%	63.00%
Sales Revenue, Net [Member] | Customer Concentration Risk Two [Member]
Concentration Risk, Percentage	38.00%	25.00%	34.00%	25.00%
Sales Revenue, Net [Member] | Customer Concentration Risk Three [Member]
Concentration Risk, Percentage	15.00%	11.00%	6.00%

Balance Sheet Components - Inve

Balance Sheet Components - Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Balance Sheet Components
Work in progress	$ 304	$ 191
Finished goods	1,778	1,192
Total inventories	$ 2,082	$ 1,383	[1]
[1]	The condensed consolidated balance sheet as of December 31, 2018 was derived from the audited consolidated balance sheet as of that date.

Balance Sheet Components - Prop

Balance Sheet Components - Property and equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment, Gross	$ 893	$ 868
Less: Accumulated depreciation and amortization	(786)	(758)
Property and equipment, net	107	110	[1]
Machinery and equipment [Member]
Property, Plant and Equipment, Gross	771	746
Tooling [Member]
Property, Plant and Equipment, Gross	7	7
Computer software [Memebr]
Property, Plant and Equipment, Gross	89	89
Furniture and fixtures [Member]
Property, Plant and Equipment, Gross	15	15
Leasehold improvements [Member]
Property, Plant and Equipment, Gross	$ 11	$ 11
[1]	The condensed consolidated balance sheet as of December 31, 2018 was derived from the audited consolidated balance sheet as of that date.

Balance Sheet Components - Accr

Balance Sheet Components - Accrued liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Balance Sheet Components
Accrued vacation	$ 261	$ 238
Accrued compensation		17
Accrued bonus		158
Customer advances	131	186
Accrued other	368	247
Total accrued liabilities	$ 760	$ 846	[1]
[1]	The condensed consolidated balance sheet as of December 31, 2018 was derived from the audited consolidated balance sheet as of that date.

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Balance Sheet Components
Depreciation, Depletion and Amortization	$ 14	$ 9	$ 28	$ 19

Promissory Notes (Details)

Promissory Notes (Details) - USD ($)

Apr. 04, 2015

Jan. 05, 2015

Jul. 25, 2018

Feb. 28, 2018

Nov. 30, 2016

Feb. 29, 2016

Dec. 22, 2015

Sep. 18, 2015

Apr. 30, 2014

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Dec. 31, 2016

Apr. 18, 2019

Jun. 15, 2018

Nov. 30, 2017

Jan. 31, 2017

Dec. 31, 2011

Oct. 31, 2010

Short-term Debt [Line Items]

Royalty Guarantees, Commitments, Amount

$ 900,000

Accrued Royalties

$ 900,000

Debt Instrument, Face Amount

$ 6,500,000

$ 300,000

Repayments of Bank Debt

$ 450,000

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

255,102

208,350

Debt Conversion, Converted Instrument, Shares Issued

99,594

Hallo Note [Member]

Short-term Debt [Line Items]

Debt Conversion, Original Debt, Amount

$ 358,000

Debt Instrument, Interest Rate, Stated Percentage

18.00%

Debt Instrument, Maturity Date

Jun. 30, 2018

Dec. 31, 2015

Debt Instrument, Payment Terms

In December 2016, following a principal reduction payment of $38,000, the Hallo Note was amended as follows: (i) the maturity date was changed to "five days following an IPO", (ii) following a debt or equity financing in excess of $4,000,000, the Company would make a principal reduction payment of $13,000, (iii) on the maturity date, the Company would make a principal reduction payment of $95,000, and (iv) the remaining unpaid principal and accrued interest, after the payments described in (ii) and (iii) above, shall automatically convert to shares in connection with an initial public offering, at a conversion price equal to the average of the highest and the lowest price of the related stock that the Company sold on the maturity date

Debt Instrument Convertible Conversion Price Description

the Hallo note holders agreed to amend the conversion price language in their respective convertible notes to be the lower of (i) $4.50 or (ii) the initial price of the Company's common stock sold pursuant to an IPO

Interest Expense, Debt

$ 10,000

$ 20,000

Debt Conversion, Converted Instrument, Shares Issued

56,723

January 2015 Note [Member]

Short-term Debt [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

15.00%

10.00%

Debt Instrument, Maturity Date

Jul. 5, 2015

Jun. 30, 2018

Sep. 1, 2017

Debt Instrument, Payment Terms

In December 2016, following a principal reduction payment of $23,000, the January 2015 Note was amended as follows: (i) the maturity date was changed to "five days following an IPO", (ii) following a debt or equity financing in excess of $4,000,000 prior to an IPO, the Company would make a principal reduction payment of $13,000, (iii) on the maturity date, the Company would make a principal reduction payment of $95,000, and (iv) the remaining unpaid principal and accrued interest, after the payments described in (ii) and (iii) above, shall automatically convert to shares in connection with the IPO, at a conversion price equal to the average of the highest and the lowest price of the related stock that the Company sold on the maturity date

Debt Instrument Convertible Conversion Price Description

the January 2015 Note holders agreed to amend the conversion price language in their respective convertible notes to be the lower of (i) $4.50 or (ii) the initial price of the Company's common stock sold pursuant to an IPO

Interest Expense, Debt

4,000

9,000

Debt Instrument, Face Amount

$ 500,000

Debt Instrument, Periodic Payment, Principal

$ 225,000

Debt Conversion, Converted Instrument, Shares Issued

39,653

April 2015 Note [Member]

Short-term Debt [Line Items]

Debt Instrument, Maturity Date

Jan. 31, 2017

Jun. 30, 2018

Sep. 1, 2017

Debt Instrument, Payment Terms

Interest accrues at a rate 5.0% per year during the first twelve months and increases to 10.0% per year through maturity

Debt Instrument Convertible Conversion Price Description

The conversion price is the lesser of $4.50 or the highest price per common share sold in the IPO or paid by a buyer upon a change in control multiplied by 75%

Interest Expense, Debt

11,000

22,000

Debt Instrument, Face Amount

$ 450,000

Debt Conversion, Converted Instrument, Shares Issued

155,373

September 2015 Note [Member]

Short-term Debt [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

10.00%

Debt Instrument, Maturity Date

Jun. 30, 2018

Sep. 1, 2017

Jan. 31, 2017

Debt Instrument Convertible Conversion Price Description

The conversion price is the lesser of $4.50 or the highest price per common share sold in the IPO or paid by a buyer upon a change in control multiplied by 75%

Interest Expense, Debt

5,000

9,900

Debt Instrument, Face Amount

$ 200,000

Debt Conversion, Converted Instrument, Shares Issued

68,544

December 2015 Note [Member]

Short-term Debt [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

12.00%

Debt Instrument, Maturity Date

Sep. 22, 2016

Sep. 1, 2017

Debt Instrument Convertible Conversion Price Description

The conversion price is the lesser of $4.50 or the highest price per common share sold in an initial public offering or paid by a buyer upon a change in control multiplied by 75%.

Debt Instrument, Face Amount

$ 353,000

Debt Conversion, Converted Instrument, Shares Issued

11,295

February 2016 Notes [Member]

Short-term Debt [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

10.00%

Debt Instrument, Maturity Date

Feb. 1, 2017

Debt Instrument Convertible Conversion Price Description

The conversion price is the lesser of $4.50 or the highest price per common share sold in the IPO or paid by a buyer upon a change in control multiplied by 75%.

Interest Expense, Debt

4,000

7,500

Debt Instrument, Face Amount

$ 250,000

$ 100,000

Amortization of Debt Discount (Premium)

$ 0

$ 0

$ 0

$ 0

Interest Payable

$ 9,000

Debt Conversion, Converted Instrument, Shares Issued

49,815

February 2016 Notes [Member] | Warrant [Member]

Short-term Debt [Line Items]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

111,112

111,112

Convertible Notes Payable (Deta

Convertible Notes Payable (Details) - USD ($)	Jul. 15, 2018	May 11, 2016	Feb. 12, 2016	Sep. 30, 2018	Jul. 25, 2018	Jun. 30, 2018	Jun. 29, 2018	Jun. 15, 2018	Feb. 28, 2018	Nov. 30, 2017	Nov. 30, 2016	Jul. 31, 2016	Sep. 18, 2015	May 25, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Oct. 31, 2016	Dec. 31, 2017	Dec. 31, 2017	Apr. 18, 2019	Dec. 31, 2018	Jan. 31, 2017	Dec. 31, 2016	Feb. 29, 2016
Debt Instrument, Face Amount										$ 6,500,000																$ 300,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								208,350																255,102
Debt Conversion, Converted Instrument, Shares Issued					99,594
Proceeds from Convertible Debt																			$ 0	$ 1,435,000
Interest Expense															$ 0	$ 10,593,000			0	19,331,000
General and Administrative Expense															$ 657,000	418,000			$ 1,272,000	1,649,000
Class of Warrant or Right, Exercise Price of Warrants or Rights																										$ 5.40
Debt Instrument, Debt Default, Amount						$ 26,400,000		$ 1,725,000								26,400,000				26,400,000
Investment Bankers [Member]
Number of Warrants Issued																			5,000
Lender [Member]
Number of Warrants Issued																			25,000
Mr Moyer [Member]
Reimbursable Expenses																							$ 69,000
Mr Jonathan Gadzak [Member]
Certain Expenses to be converted																							12,000
Series C Convertible Notes [Member]
Debt Instrument, Maturity Date									Aug. 28, 2018
Debt Instrument Convertible Conversion Price Description									The conversion price in effect upon an initial public offering is the lesser of $9.00 or the price per common share in the pre-money valuation immediately prior to the initial public offering multiplied by 80%. The conversion price at any other conversion event is $9.00.
Amortization of Debt Discount (Premium)																0				0
Debt Conversion, Converted Instrument, Shares Issued					7,353				327
Proceeds from Convertible Debt																					$ 2,880,000
Debt Instrument, Unamortized Discount, Current									$ 209,000
Extinguishment of Debt, Amount																							2,855,000
Interest Payable																						$ 172,000	172,000				$ 25,000
Interest Expense																0				0
Promissory Notes [Member]
Extinguishment of Debt, Amount																							236,000
Interest Payable																						19,000	19,000
Series D Convertible Notes [Member]
Debt Instrument, Maturity Date									Jun. 30, 2018
Debt Instrument Convertible Conversion Price Description				The conversion price in effect upon on initial public offering is the lesser of $4.50 or the highest price per common share sold in the initial public offering multiplied by 75%. The conversion price at any other conversion event is $4.50.
Interest Expense, Debt																2,837,000				3,845,000
Amortization of Debt Discount (Premium)																1,402,000				2,875,000
Debt Conversion, Converted Instrument, Shares Issued					3,783,334
Debt Instrument, Convertible, Conversion Price																									$ 4.50
Debt Instrument, Unamortized Discount, Current																						386,000	386,000
Debt Instrument, Interest Rate, Increase (Decrease)									10.00%
Series D Convertible Notes [Member] | Investor [Member]
Proceeds from Convertible Debt																							$ 4,717,000
Series E Convertible Notes [Member]
Debt Instrument Convertible Conversion Price Description													The conversion price at any other conversion event is the lessor of $4.50 or the price per share issued by the Company in connection with any sale involving substantially all the assets of the Company
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					487,864
Amortization of Debt Discount (Premium)																$ 70,000				$ 70,000
Debt Instrument, Convertible, Conversion Price																									$ 4.50
Proceeds from Convertible Debt																		$ 5,000,000
Debt Instrument, Unamortized Discount, Current																									$ 275,000
Repayments of Convertible Debt										5,882,000
Default Interest And Penalties										1,098,000
Reimbursement Of Legal Fees										179,000
Reimbursement Of Consulting Travel And Lodging Fees										102,000
Repayments of Debt										$ 7,261,000
Interest Expense																						1,980,000
General and Administrative Expense																						281,000
Legal Fees																						179,000
Consulting Expenses																						$ 102,000
Warrants Issuable In Connection With Default Notice										487,865
Series F Convertible Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage						15.00%										15.00%				15.00%
Debt Instrument Convertible Conversion Price Description						The conversion price in effect upon on an initial public offering shall be the lesser of $4.50 or the highest price per common share sold in the initial public offering multiplied by 60%.
Interest Expense, Debt																$ 393,000				$ 757,000
Amortization of Debt Discount (Premium)																$ 5,124,000				$ 10,669,000
Debt Conversion, Converted Instrument, Shares Issued					3,849,210
Debt Instrument, Convertible, Conversion Price						$ 4.50										$ 4.50	$ 4.50			$ 4.50
Proceeds from Convertible Debt														$ 225,000			$ 10,345,000
Debt Instrument, Unamortized Discount, Current																	$ 135,000
Convertible Notes Payable [Member]
Debt Conversion, Converted Instrument, Shares Issued					9,527,144
Series G Convertible Notes [Member]
Debt Instrument, Face Amount							$ 2,813,000
Debt Instrument, Maturity Date								Jul. 15, 2018
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	625,000
Amortization of Debt Discount (Premium)																$ 197,000				$ 197,000
Debt Conversion, Converted Instrument, Shares Issued					1,406,250
Proceeds from Convertible Debt							$ 2,200,000
Interest Expense																450,000				450,000
Cancellation of Reimbursement Payable																				50,000
Convertible Notes Payable	$ 2,813,000
Debt Instrument Original Issue Discount								15.00%
Increase in Debt Instrument Original Issue Discount								20.00%
Debt Conversion, Description	(i) extend the maturity date of such notes from July 15, 2018 to July 25, 2018 and (ii) agreed to make the Series G Notes automatically convertible in connection with an initial public offering at a conversion price of the lesser of $4.50 or 40% of the highest price of the common stock sold in an initial public offering.
Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights																									$ 5.40
Warrant [Member] | Series C Convertible Notes [Member] | Investment Bankers [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															26,354				26,354
Warrant [Member] | Series C Convertible Notes [Member] | Investor [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															188,236				188,236
Warrant [Member] | Series D Convertible Notes [Member]
Class of Warrant or Right, Outstanding															2,035,434				2,035,434
Warrant [Member] | Series D Convertible Notes [Member] | Investment Bankers [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															380,449				380,449
Warrant [Member] | Series D Convertible Notes [Member] | Investor [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															1,017,692				1,017,692
Warrant [Member] | Series E Convertible Notes [Member]
Class of Warrant or Right, Outstanding										3,102,245
Warrant [Member] | Series E Convertible Notes [Member] | Investment Bankers [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															114,380				114,380
Warrant [Member] | Series E Convertible Notes [Member] | Investor [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															1,307,190				1,307,190
Warrant [Member] | Series F Convertible Notes [Member] | Investment Bankers [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															233,111				233,111
Warrant [Member] | Series F Convertible Notes [Member] | Lender [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															1,174,447				1,174,447
Warrant [Member] | Series G Convertible Notes [Member] | Investment Bankers [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															58,334				58,334
Warrant [Member] | Series G Convertible Notes [Member] | Lender [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															833,350				833,350
February 2016 Note [Member]
Debt Instrument, Face Amount			$ 300,000
Debt Instrument, Interest Rate, Stated Percentage			10.00%
Debt Instrument, Maturity Date			Jan. 31, 2017						Jun. 30, 2018		Sep. 1, 2017
Debt Instrument Convertible Conversion Price Description											The conversion price is the lesser of $4.50 or the highest price per common share sold in the IPO or paid by a buyer upon a change in control multiplied by 75%.
Interest Expense, Debt																8,000				15,000
Amortization of Debt Discount (Premium)																$ 0				$ 0
February 2016 Note [Member] | Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																												33,334
May 2016 Note [Member]
Proceeds from Collection of Advance from Significant Shareholder		$ 300,000
Minimum Investments to be Received		$ 500,000
Proceeds from Collection of Additional Investments from Significant Shareholder												$ 201,000
Debt Conversion, Original Debt, Amount												$ 201,000
Debt Instrument, Convertible, Conversion Price												$ 4.50
May 2016 Note [Member] | Preferred Stock [Member]
Debt Conversion, Converted Instrument, Shares Issued												111,307

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Quoted prices in active markets (Level 1) [Member]
Liabilities:
Derivative liability	$ 0
Warrant liability	0	$ 0
Significant other observable inputs (Level 2) [Member]
Liabilities:
Derivative liability	0
Warrant liability	0	0
Significant unobservable inputs (Level 3) [Member]
Liabilities:
Derivative liability	387
Warrant liability	$ 39	$ 210

Fair Value Measurements - Summa

Fair Value Measurements - Summary of changes in fair value of the Company's warrant liability measured at fair value using significant unobservable inputs (Level 3) (Details) - Warrant [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Beginning balance	$ 103	$ 927	$ 210	$ 1,228
Additions	0	65	4	65
Change in fair value	(64)	4,358	(175)	4,249
Reclass to additional paid-in capital	0			(192)
Ending balance	$ 39	$ 5,350	$ 39	$ 5,350

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of the weighted average significant unobservable inputs (Level 3 inputs) used in measuring the Company's warrant liability that is categorized within Level 3 of the fair value hierarchy (Details) - Significant unobservable inputs (Level 3) [Member] - Warrant [Member]	Jun. 30, 2019$ / shares	Dec. 31, 2018$ / shares
Common Stock Price	$ 1.16	$ 3.42
Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	3.77	4.27
Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	59	58
Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	1.74	2.58
Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0	0

Fair Value Measurements - Sum_3

Fair Value Measurements - Summary of changes in fair value of the Company's derivative liability measured at fair value using significant unobservable inputs (Level 3) (Details) - Derivative [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Beginning balance	$ 0	$ 22,959	$ 0	$ 20,832
Additions	216	245	216	1,558
Change in fair value	171	2,572	171	3,386
Ending balance	$ 387	$ 25,776	$ 387	$ 25,776

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - $ / shares	3 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2019
Series A Preferred Stock [Member]
Debt Instrument, Convertible, Conversion Price			$ 1.50
Debt Instrument, Interest Rate, Stated Percentage			95.00%
Measurement Input, Default Rate [Member]
Fair Value Input Probability Of Default	25.00%	75.00%

Preferred Stock and Stockhold_3

Preferred Stock and Stockholders' Equity - (Details) - USD ($)	Apr. 18, 2019	Jun. 30, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Temporary Equity, Shares Authorized		1,250,000	1,250,000
Liquidation preference		$ 1,016,000	$ 0
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Temporary Equity, Shares Authorized		1,250,000
Preferred Stock, Shares Issued and Outstanding		250,000
Proceeds from the issuance of preferred stock, net of issuance costs	$ 1,000,000	$ 920,000
Conversion price per share	$ 4	$ 4
Liquidation preference		$ 1,016,000

Preferred Stock and Stockhold_4

Preferred Stock and Stockholders' Equity - Warrants for common stock outstanding and exercisable (Details) - Warrant [Member]	6 Months Ended
	Jun. 30, 2019$ / sharesshares
Class of Stock [Line Items]
Exercise Price | $ / shares	$ 3.69
Warrants Outstanding	9,060,003
Remaining Life (years)	3 years 6 months 11 days
Warrants Exercisable	8,731,915
Exercise Price Range One [Member]
Class of Stock [Line Items]
Warrants Outstanding	693,190
Remaining Life (years)	4 years 3 days
Warrants Exercisable	365,102
Exercise Price Range Two [Member]
Class of Stock [Line Items]
Warrants Outstanding	5,522,720
Remaining Life (years)	3 years 8 months 19 days
Warrants Exercisable	5,522,720
Exercise Price Range Two [Member] | Minimum [Member]
Class of Stock [Line Items]
Exercise Price | $ / shares	$ 3
Exercise Price Range Two [Member] | Maximum [Member]
Class of Stock [Line Items]
Exercise Price | $ / shares	$ 4
Exercise Price Range Three [Member]
Class of Stock [Line Items]
Warrants Outstanding	298,882
Remaining Life (years)	2 years 5 months 26 days
Warrants Exercisable	298,882
Exercise Price Range Three [Member] | Minimum [Member]
Class of Stock [Line Items]
Exercise Price | $ / shares	$ 4.50
Exercise Price Range Three [Member] | Maximum [Member]
Class of Stock [Line Items]
Exercise Price | $ / shares	$ 4.95
Exercise Price Range Four Member [Member]
Class of Stock [Line Items]
Warrants Outstanding	2,543,577
Remaining Life (years)	3 years 29 days
Warrants Exercisable	2,543,577
Exercise Price Range Four Member [Member] | Minimum [Member]
Class of Stock [Line Items]
Exercise Price | $ / shares	$ 5.40
Exercise Price Range Four Member [Member] | Maximum [Member]
Class of Stock [Line Items]
Exercise Price | $ / shares	6.25
Exercise Price Range Five Member [Member]
Class of Stock [Line Items]
Exercise Price | $ / shares	$ 10.35
Warrants Outstanding	1,634
Remaining Life (years)	2 years 14 days
Warrants Exercisable	1,634

Preferred Stock and Stockhold_5

Preferred Stock and Stockholders' Equity - Additional Information (Details)

Sep. 01, 2019shares

Apr. 18, 2019USD ($)$ / sharesshares

Jan. 04, 2019shares

May 31, 2019USD ($)$ / sharesshares

Apr. 30, 2019USD ($)$ / sharesshares

Jul. 25, 2018shares

Apr. 30, 2018$ / sharesshares

Feb. 28, 2018shares

Jan. 31, 2018shares

Jun. 30, 2019USD ($)$ / sharesshares

Mar. 31, 2019USD ($)shares

Jun. 30, 2018USD ($)$ / sharesshares

Jun. 30, 2019USD ($)$ / sharesshares

Jun. 30, 2018USD ($)$ / sharesshares

Dec. 31, 2018$ / sharesshares

Jul. 26, 2018shares

Jun. 15, 2018shares

Dec. 31, 2017shares

Jan. 31, 2017$ / shares

Jul. 23, 2010shares

Class of Stock [Line Items]

Preferred Stock, Shares Issued

2,762,594

2,762,594

41,438,818

Temporary Equity, Shares Issued

250,000

250,000

0

Temporary Equity, Dividend Rate, Percentage

8.00%

8.00%

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

255,102

208,350

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 5.40

Fair Value Adjustment of Warrants | $

$ (64,000)

$ 4,358,000

$ (175,000)

$ 4,249,000

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights

In the event an employee voluntarily resigns, the release dates of the shares will be extended such that only 16.5% of the shares are released every nine months, until 100% are released. In the event that a director voluntarily resigns, each of the release dates will be extended nine months

Debt Conversion, Converted Instrument, Shares Issued

99,594

Stock Issued During Period, Value, Restricted Stock Award, Gross | $

$ (65,000)

Payments Related to Tax Withholding for Share-based Compensation | $

$ 65,000

$ 0

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant

492,808

492,808

Deferred Compensation Arrangement with Individual, Shares Issued

400,000

Share-based Compensation Award, Tranche One [Member]

Class of Stock [Line Items]

Stock Issued During Period, Shares, Restricted Stock Award, Gross

464,632

Series C Convertible Note [Member]

Class of Stock [Line Items]

Debt Conversion, Converted Instrument, Shares Issued

327

Warrant [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 5.40

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options

8,731,915

8,731,915

Warrant [Member] | Series F Convertible Note [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

25,000

25,000

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 5.40

$ 5.40

Warrant Term

5 years

Fair Value Adjustment of Warrants | $

$ 44,000

Warrant [Member] | Series F Convertible Note [Member] | Investment Bankers [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

3,222

3,222

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 5.40

$ 5.40

Warrant Term

5 years

Fair Value Adjustment of Warrants | $

$ 5,700

Warrant [Member] | Series G Convertible Note [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

208,350

208,350

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 5.40

$ 5.40

Warrant Term

5 years

Fair Value Adjustment of Warrants | $

$ 366,000

Warrant [Member] | Series G Convertible Note [Member] | Investment Bankers [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

58,334

58,334

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 5.40

$ 5.40

Warrant Term

5 years

Fair Value Adjustment of Warrants | $

$ 102,000

Warrant [Member] | Measurement Input, Expected Dividend Rate [Member] | Series F Convertible Note [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

0

0

Warrant [Member] | Measurement Input, Expected Dividend Rate [Member] | Series F Convertible Note [Member] | Investment Bankers [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

0

0

Warrant [Member] | Measurement Input, Expected Dividend Rate [Member] | Series G Convertible Note [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

0

0

Warrant [Member] | Measurement Input, Expected Dividend Rate [Member] | Series G Convertible Note [Member] | Investment Bankers [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

0

0

Warrant [Member] | Measurement Input, Price Volatility [Member] | Series F Convertible Note [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

57

57

Warrant [Member] | Measurement Input, Price Volatility [Member] | Series G Convertible Note [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

57

57

Warrant [Member] | Measurement Input, Price Volatility [Member] | Series G Convertible Note [Member] | Investment Bankers [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

57

57

Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] | Series F Convertible Note [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

2.82

2.82

Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] | Series F Convertible Note [Member] | Investment Bankers [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

2.82

2.82

Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] | Series G Convertible Note [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

2.81

2.81

Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] | Series G Convertible Note [Member] | Investment Bankers [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

2.82

2.82

Warrant [Member] | Measurement Input, Expected Term [Member] | Series G Convertible Note [Member]

Class of Stock [Line Items]

Warrant Term

5 years

Warrant [Member] | Measurement Input, Expected Term [Member] | Series G Convertible Note [Member] | Investment Bankers [Member]

Class of Stock [Line Items]

Warrant Term

5 years

Restricted Stock [Member]

Class of Stock [Line Items]

Allocated Share-based Compensation Expense | $

$ 2,156,000

Share-based Compensation Award, Tranche One [Member]

Class of Stock [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage

33.40%

Share-based Compensation Award, Tranche Two [Member]

Class of Stock [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage

33.30%

Stock Issued During Period, Shares, Restricted Stock Award, Gross

28,176

Share-based Compensation Award, Tranche Three [Member]

Class of Stock [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage

33.30%

Employees [Member]

Class of Stock [Line Items]

Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures

1,284,470

Director [Member]

Class of Stock [Line Items]

Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures

153,126

Mr Michael Howse [Member] | Warrant [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

275,000

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 5.40

Fair Value Adjustment of Warrants | $

$ 0

$ 4,000

Share Price | $ / shares

$ 1.66

$ 1.66

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period

110,000

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number

110,000

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options

165,000

165,000

Mr Michael Howse [Member] | Warrant [Member] | Measurement Input, Expected Dividend Rate [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

0

0

Mr Michael Howse [Member] | Warrant [Member] | Measurement Input, Price Volatility [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

59

59

Mr Michael Howse [Member] | Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

1.74

1.74

Mr Michael Howse [Member] | Warrant [Member] | Measurement Input, Expected Term [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Term

3 years 9 months 7 days

3 years 9 months 7 days

Walsh [Member] | Warrant [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

225,102

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 1.98

Fair Value Adjustment of Warrants | $

$ 216,000

Share Price | $ / shares

$ 2.08

Walsh [Member] | Warrant [Member] | Measurement Input, Expected Dividend Rate [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

0

Walsh [Member] | Warrant [Member] | Measurement Input, Price Volatility [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

59

Walsh [Member] | Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

2.38

Walsh [Member] | Warrant [Member] | Measurement Input, Expected Term [Member]

Class of Stock [Line Items]

Warrant Term

5 years

Alexander Capital [Member] | Warrant [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

122,272

40,816

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 1.66

$ 2.18

Fair Value Adjustment of Warrants | $

$ 70,000

$ 43,000

Share Price | $ / shares

$ 1.36

$ 2.08

Alexander Capital [Member] | Warrant [Member] | Measurement Input, Expected Dividend Rate [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

0

0

Alexander Capital [Member] | Warrant [Member] | Measurement Input, Price Volatility [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

60

59

Alexander Capital [Member] | Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]

Class of Stock [Line Items]

Warrants and Rights Outstanding, Measurement Input

2.18

2.38

Alexander Capital [Member] | Warrant [Member] | Measurement Input, Expected Term [Member]

Class of Stock [Line Items]

Warrant Term

4 years

5 years

LongTerm Stock Incentive Plan [Member]

Class of Stock [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award Maximum Percentage of Shares Authorized

15.00%

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized

300,000

Stock Issued During Period, Shares, Restricted Stock Award, Gross

471,697

Stock Issued During Period, Value, Restricted Stock Award, Gross | $

$ 1,000,000

Stock Issued During Period, Value, Restricted Stock Award, Forfeitures | $

$ 323,162

Restricted Stock Shares Withheld

24,687

Payments Related to Tax Withholding for Share-based Compensation | $

$ 65,000

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant

2,304,909

2,304,909

Common Shares [Member]

Class of Stock [Line Items]

Stock Issued During Period, Shares, Restricted Stock Award, Gross

123,848

Stock Issued During Period, Value, Restricted Stock Award, Gross | $

$ 0

Stock Issued During Period, Shares, Issued for Services

161,530

Common Shares [Member] | Warrant [Member] | Series F Convertible Note [Member]

Class of Stock [Line Items]

Share Price | $ / shares

$ 4.03

$ 4.03

Common Shares [Member] | Warrant [Member] | Series F Convertible Note [Member] | Investment Bankers [Member]

Class of Stock [Line Items]

Share Price | $ / shares

4.03

4.03

Common Shares [Member] | Warrant [Member] | Series G Convertible Note [Member]

Class of Stock [Line Items]

Share Price | $ / shares

4.03

4.03

Common Shares [Member] | Warrant [Member] | Series G Convertible Note [Member] | Investment Bankers [Member]

Class of Stock [Line Items]

Share Price | $ / shares

$ 4.03

$ 4.03

Series A Preferred Stock [Member]

Class of Stock [Line Items]

Temporary Equity, Shares Issued

250,000

Temporary Equity, Par Value Per Share | $ / shares

$ 0.0001

Temporary Equity, Stated Value Per Share | $ / shares

$ 4

Temporary Equity, Dividend Rate, Percentage

8.00%

Convertible Preferred Stock Conversion Price | $ / shares

$ 4

$ 4

$ 4

Convertible Preferred Stock Floor Price Per Share | $ / shares

$ 1.50

Convertible Preferred Stock, Convertible, Issue of Shares, Threshold Percentage

19.99

Proceeds from Issuance of Convertible Preferred Stock | $

$ 1,000,000

$ 920,000

Embedded Derivative, Fair Value of Embedded Derivative Liability | $

$ 216,000

Preferred Stock, Convertible, Threshold Trading Days

5 days

Cumulative Dividends | $

16,000

$ 16,000

Preferred stock, Redemption Value Percentage

120.00%

Series A Preferred Stock [Member] | Warrant [Member]

Class of Stock [Line Items]

Fair value of warrant | $

$ 200,000

$ 200,000

Series A Preferred Stock [Member] | Minimum [Member]

Class of Stock [Line Items]

Convertible Preferred Stock Conversion Price | $ / shares

$ 1.50

Proceeds from Issuance of Convertible Preferred Stock | $

$ 500,000

Preferred stock, Redemption Basis, Amount Sought or Declared | $

100,000

Preferred stock, Redemption Basis, Gain or Loss on Property | $

100,000

Series A Preferred Stock [Member] | Maximum [Member]

Class of Stock [Line Items]

Proceeds from Issuance of Convertible Preferred Stock | $

$ 5,000,000

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Taxes
Income Tax Expense (Benefit)	$ 1	$ 0	$ 7	$ 2
Effective Income Tax Rate Reconciliation, Percent			(0.04%)	(0.13%)

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Commitments and Contingencies
Operating Leases, Rent Expense		$ 99,000	$ 91,000	$ 189,000	$ 179,000
Lease Expiration Date	Oct. 31, 2020
Operating Leases, Future Minimum Payments		179,000		179,000
Operating Leases, 2019		304,000		304,000
Operating Leases, 2020		$ 304,000		$ 304,000

Related Parties (Details)

Related Parties (Details) - USD ($)	Apr. 18, 2019	Jan. 04, 2019	Apr. 18, 2019	Jul. 25, 2018	Jun. 30, 2018	Apr. 30, 2018	Feb. 28, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	May 31, 2019	Jul. 31, 2018	Jul. 15, 2018	Jun. 29, 2018	Jun. 15, 2018	Apr. 06, 2018	Nov. 30, 2017	May 17, 2017	Jan. 31, 2017
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	255,102		255,102														208,350
Class of Warrant or Right, Exercise Price of Warrants or Rights																					$ 5.40
Debt Instrument, Face Amount																			$ 6,500,000		$ 300,000
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right				13,889															722,222		39,216
Debt Conversion, Converted Instrument, Shares Issued				99,594
Deferred Compensation Arrangement with Individual, Shares Issued		400,000
Series A Preferred Stock [Member]
Proceeds from Issuance of Convertible Preferred Stock	$ 1,000,000							$ 920,000
Minimum [Member] | Series A Preferred Stock [Member]
Proceeds from Issuance of Convertible Preferred Stock	500,000
Maximum [Member] | Series A Preferred Stock [Member]
Proceeds from Issuance of Convertible Preferred Stock	$ 5,000,000
Alexander Capital [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 2.18		$ 2.18
Debt Instrument, Maturity Date										Apr. 18, 2024
Number of Warrants Issued										40,816
Financial Service [Member] | Alexander Capital [Member]
Investment Income, Net								$ 80,000	$ 200,250	$ 80,000	$ 321,300
Series G Notes [Member] | Medalist Funds [Member]
Convertible Notes Payable, Current																$ 2,438,000
Series F Convertible Notes [Member]
Debt Conversion, Converted Instrument, Shares Issued				3,849,210
Series F Convertible Notes [Member] | Medalist Funds [Member]
Convertible Notes Payable, Current																			$ 2,000,000
Series E Convertible Notes [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				487,864
Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights												$ 5.40
Warrant [Member] | Medalist Funds [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																180,570			222,222
Brett Moyer [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights															$ 4.50
Other Expenses						$ 50,000
Convertible Notes Payable, Current								0		$ 0		$ 0
Debt Conversion Converted Instrument Percentage of Shares Held										1.20%		1.50%
Brett Moyer [Member] | Series G Notes [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 3.60
Debt Instrument, Face Amount						$ 63,000
Debt Conversion, Converted Instrument, Shares Issued				157,881
Debt Conversion, Converted Instrument, Amount				$ 537,000
Brett Moyer [Member] | Series D Convertible Note [Member]
Debt Instrument, Interest Rate, Increase (Decrease)							10.00%
Debt Instrument, Maturity Date							Jun. 30, 2018
Brett Moyer [Member] | Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights							9,058
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right					4,630				4,630		4,630
Jonathan Gazdak [Member]
Convertible Notes Payable, Current								$ 0		$ 0		$ 0
Debt Conversion Converted Instrument Percentage of Shares Held										1.00%		1.00%
Debt Conversion, Converted Instrument, Shares Issued				5,647
Debt Conversion, Converted Instrument, Amount				$ 21,000
Jonathan Gazdak [Member] | Series D Convertible Note [Member]
Debt Instrument, Interest Rate, Increase (Decrease)							10.00%
Debt Instrument, Maturity Date							Jun. 30, 2018
Jonathan Gazdak [Member] | Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights							1,569
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 5.40
Jonathan Gazdak [Member] | Warrant [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 3.30		$ 3.30
Jonathan Gazdak [Member] | Warrant [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 5.40		$ 5.40
Brian Herr [Member]
Convertible Notes Payable, Current								$ 0		$ 0		$ 0
Debt Conversion Converted Instrument Percentage of Shares Held										10.00%		12.70%
Brian Herr [Member] | Series G Notes [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights														541,666
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 3										$ 4.50
Debt Conversion, Converted Instrument, Shares Issued				1,950,348
Debt Conversion, Converted Instrument, Amount				$ 3,950,000
Michael Howse [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								110,000		110,000
Debt Conversion Converted Instrument Percentage of Shares Held										0.00%
Deferred Compensation Arrangement with Individual, Shares Issued		400,000
Michael Howse [Member] | Achievement of significant milestone [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																		110,000
Michael Howse [Member] | Achievement additional significant milestone [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																		65,000
Michael Howse [Member] | Share-based Compensation Award, Tranche One [Member] | chief strategy officerMember [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights																		$ 2
Michael Howse [Member] | Share-based Compensation Award, Tranche Two [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																		165,000
Michael Howse [Member] | Share-based Compensation Award, Tranche Two [Member] | chief strategy officerMember [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights																		$ 2
Michael Howse [Member] | Warrant [Member] | Share-based Compensation Award, Tranche One [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																		110,000
Helge Kristensen [Member]
Convertible Notes Payable, Current								$ 0		$ 0		$ 0
Debt Conversion Converted Instrument Percentage of Shares Held										1.00%		1.00%
Debt Conversion, Converted Instrument, Shares Issued				27,923
Debt Conversion, Converted Instrument, Amount				$ 50,000
Helge Kristensen [Member] | Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights												$ 5.40
Helge Kristensen [Member] | Warrant [Member] | Inizio Capital [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights												1,341
Helge Kristensen [Member] | Warrant [Member] | Hansong Technology [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights												942
Carl E Berg [Member]
Convertible Notes Payable, Current				$ 1,479,000				0		$ 0		$ 0
Debt Conversion Converted Instrument Percentage of Shares Held										8.10%		10.40%
Debt Conversion, Converted Instrument, Shares Issued				464,687
Carl E Berg [Member] | Other Convertible Notes [Member]
Debt Instrument, Interest Rate, Increase (Decrease)							10.00%
Carl E Berg [Member] | Series D Convertible Note [Member]
Debt Instrument, Maturity Date							Jun. 30, 2018
Carl E Berg [Member] | Warrant [Member] | Other Convertible Notes [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights							25,965
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 5.40
Carl E Berg [Member] | Warrant [Member] | Series D Convertible Note [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights							39,216
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 5.40
Lisa Walsh [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights																			$ 5.40
Convertible Notes Payable, Current								0		$ 0		$ 0
Lisa Walsh [Member] | Series G Notes [Member]
Debt Instrument, Maturity Date					Jul. 15, 2018
Lisa Walsh [Member] | Series D Convertible Note [Member]
Debt Instrument, Interest Rate, Increase (Decrease)							10.00%
Debt Instrument, Maturity Date							Jun. 30, 2018
Lisa Walsh [Member] | Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights							112,419
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 5.40
Walsh [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				2,938,650										69,444			23,150
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 3										$ 4.50			$ 4.50
Convertible Notes Payable, Current				$ 8,330,000
Debt Conversion Converted Instrument Percentage of Shares Held										20.70%		26.40%
Walsh [Member] | Series A Preferred Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	250,000		250,000
Proceeds from Issuance of Convertible Preferred Stock			$ 1,000,000
Walsh [Member] | Series G Notes [Member]
Debt Instrument, Face Amount															$ 288,000
Walsh [Member] | Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	255,102		255,102
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1.98		$ 1.98
Michael Fazio [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 3																$ 4.50
Convertible Notes Payable, Current								$ 0		$ 0		$ 0
Debt Conversion Converted Instrument Percentage of Shares Held										1.00%		1.00%
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right				487,864																2,614,381
Michael Fazio [Member] | Series E Convertible Notes [Member]
Debt Instrument, Face Amount																				$ 5,000,000
Underwriting Agreement [Member] | Alexander Capital [Member]
Payments of Stock Issuance Costs										$ 900,000
Underwriting Agreement [Member] | Alexander Capital [Member] | Non Accountable Expense Allowance [Member]
Payments of Stock Issuance Costs										120,000
Underwriting Agreement [Member] | Alexander Capital [Member] | Reimbursements [Member]
Payments of Stock Issuance Costs										$ 100,000
Underwriting Agreement [Member] | Jonathan Gazdak [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								72,000		72,000
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 6.25		$ 6.25
Warrants and Rights Outstanding, Term													180 days
Engagement Letter [Member] | Alexander Capital [Member]
Number of Warrants Issued										588,391
Public Offering Underwriting Agreement [Member] | Alexander Capital [Member]
Payments of Stock Issuance Costs										$ 406,554
Public Offering Underwriting Agreement [Member] | Alexander Capital [Member] | Non Accountable Expense Allowance [Member]
Payments of Stock Issuance Costs										54,207
Public Offering Underwriting Agreement [Member] | Alexander Capital [Member] | Reimbursements [Member]
Payments of Stock Issuance Costs										$ 100,000
Public Offering Underwriting Agreement [Member] | Jonathan Gazdak [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								122,272		122,272
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 1.66		$ 1.66
Warrants and Rights Outstanding, Term								365 days		365 days

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues	$ 352	$ 380	$ 817	$ 662
United States [Member]
Revenues	0	2	3	2
Europe [Member]
Revenues	138	98	287	176
Asia Pacific [Member]
Revenues	$ 214	$ 280	$ 527	$ 484