Avinger (AVGR) 10-Q 9 Nov 22 2022 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Nov. 04, 2022
Document Information [Line Items]
Entity Central Index Key	0001506928
Entity Registrant Name	Avinger Inc
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2022
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	001-36817
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-8873453
Entity Address, Address Line One	400 Chesapeake Drive
Entity Address, City or Town	Redwood City
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94063
City Area Code	650
Local Phone Number	241-7900
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	AVGR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		7,435,644

Condensed Balance Sheets (Curre

Condensed Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 17,342	$ 19,497
Accounts receivable, net of allowance for doubtful accounts of $43 at September 30, 2022 and $6 at December 31, 2021	1,554	1,393
Inventories	5,047	4,601
Prepaid expenses and other current assets	652	300
Total current assets	24,595	25,791
Right of use asset	2,449	3,179
Property and equipment, net	574	95
Other assets	333	420
Total assets	27,951	29,485
Current liabilities:
Accounts payable	612	1,394
Accrued compensation	1,344	1,609
Series A preferred stock dividends payable	3,382	0
Accrued expenses and other current liabilities	669	718
Leasehold liability, current portion	1,065	985
Total current liabilities	7,072	4,706
Borrowings, long-term portion	13,668	12,287
Leasehold liability, long-term portion	1,384	2,194
Other long-term liabilities	881	575
Total liabilities	23,005	19,762
Commitments and contingencies (Note 6)
Stockholders’ equity:
Convertible preferred stock issuable in series, par value of $0.001; Shares authorized: 5,000,000 at September 30, 2022 and December 31, 2021; Shares issued and outstanding: 56,451 at September 30, 2022 and December 31, 2021; aggregate liquidation preference of $56,366 at September 30, 2022 and December 31, 2021	0	0
Common stock, par value of $0.001; Shares authorized: 100,000,000 at September 30, 2022 and December 31, 2021; Shares issued and outstanding: 7,435,644 and 4,778,263 at September 30, 2022 and December 31, 2021, respectively	7	96
Additional paid-in capital	403,133	394,380
Accumulated deficit	(398,194)	(384,753)
Total stockholders’ equity	4,946	9,723
Total liabilities and stockholders’ equity	$ 27,951	$ 29,485

Condensed Balance Sheets (Cur_2

Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Accounts receivable, allowance for doubtful accounts	$ 43	$ 6
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	56,451	56,451
Preferred stock, shares outstanding (in shares)	56,451	56,451
Preferred stock, liquidation preference	$ 56,366	$ 56,366
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	7,435,644	4,778,263
Common stock, shares outstanding (in shares)	7,435,644	4,778,263

Condensed Statements of Operati

Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 2,252	$ 2,366	$ 6,272	$ 7,727
Cost of revenues	1,462	1,566	4,301	5,015
Gross profit	790	800	1,971	2,712
Operating expenses:
Research and development	1,086	1,397	3,244	4,502
Selling, general and administrative	3,384	3,892	10,862	11,755
Total operating expenses	4,470	5,289	14,106	16,257
Loss from operations	(3,680)	(4,489)	(12,135)	(13,545)
Interest expense, net	(407)	(419)	(1,286)	(1,214)
Other (expenses) income, net		(4)	(20)	2,343
Net loss and comprehensive loss	(4,087)	(4,912)	(13,441)	(12,416)
Accretion of preferred stock dividends	(1,127)	(1,044)	(3,381)	(3,132)
Deemed dividend arising from beneficial conversion feature of convertible preferred stock			(5,111)
Net loss applicable to common stockholders	$ (5,214)	$ (5,956)	$ (21,933)	$ (15,548)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.77)	$ (1.25)	$ (3.78)	$ (3.31)
Weighted average common shares used to compute net loss per share, basic and diluted (in shares)	6,798	4,769	5,804	4,704

Condensed Statements of Stockho

Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	January 2022 Public Offering [Member] Preferred Stock [Member]	January 2022 Public Offering [Member] Common Stock [Member]	January 2022 Public Offering [Member] Additional Paid-in Capital [Member]	January 2022 Public Offering [Member] Retained Earnings [Member]	January 2022 Public Offering [Member]	February 2021 Public Offering [Member] Preferred Stock [Member]	February 2021 Public Offering [Member] Common Stock [Member]	February 2021 Public Offering [Member] Additional Paid-in Capital [Member]	February 2021 Public Offering [Member] Retained Earnings [Member]	February 2021 Public Offering [Member]	Series D Preferred Stock [Member] Preferred Stock [Member]	Series D Preferred Stock [Member] Common Stock [Member]	Series D Preferred Stock [Member] Additional Paid-in Capital [Member]	Series D Preferred Stock [Member] Retained Earnings [Member]	Series D Preferred Stock [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2020																52,369	4,246,306
Balance at Dec. 31, 2020																$ 0	$ 85	$ 380,332	$ (367,341)	$ 13,076
Issuance of common stock under officers and directors purchase plan and vesting of restricted stock units (in shares)																0	13,242
Issuance of common stock under officers and directors purchase plan and vesting of restricted stock units																$ 0	$ 1	0	0	1
Employee stock-based compensation																0	0	960	0	960
Accretion of Series A preferred stock dividends																0	0	(3,132)	0	(3,132)
Net and comprehensive loss																$ 0	$ 0	0	(12,416)	(12,416)
Issuance of common stock in public offerings, net of commissions and issuance costs (in shares)						0	500,000
Issuance of common stock in public offerings, net of commissions and issuance costs						$ 0	$ 10	$ 13,067	$ 0	$ 13,077
Conversion of preferred stock into common stock (in shares)																(93)	18,600
Conversion of preferred stock into common stock																$ 0	$ 0	0	0	0
Balance (in shares) at Sep. 30, 2021																52,276	4,778,148
Balance at Sep. 30, 2021																$ 0	$ 96	391,227	(379,757)	11,566
Balance (in shares) at Jun. 30, 2021																52,276	4,767,650
Balance at Jun. 30, 2021																$ 0	$ 95	392,032	(374,845)	17,282
Issuance of common stock under officers and directors purchase plan and vesting of restricted stock units (in shares)																0	10,498
Issuance of common stock under officers and directors purchase plan and vesting of restricted stock units																$ 0	$ 1	0	0	1
Employee stock-based compensation																0	0	239	0	239
Accretion of Series A preferred stock dividends																0	0	(1,044)	0	(1,044)
Net and comprehensive loss																$ 0	$ 0	0	(4,912)	(4,912)
Balance (in shares) at Sep. 30, 2021																52,276	4,778,148
Balance at Sep. 30, 2021																$ 0	$ 96	391,227	(379,757)	11,566
Balance (in shares) at Dec. 31, 2021																56,451	4,778,263
Balance at Dec. 31, 2021																$ 0	$ 96	394,380	(384,753)	9,723
Employee stock-based compensation																0	0	127	0	127
Accretion of Series A preferred stock dividends																0	0	(3,381)	0	(3,381)
Net and comprehensive loss																$ 0	$ 0	0	(13,441)	(13,441)
Issuance of common stock in public offerings, net of commissions and issuance costs (in shares)	0	1,285,603									7,600	0
Issuance of common stock in public offerings, net of commissions and issuance costs	$ 0	$ 2	$ 5,194	$ 0	$ 5,196						$ 0	$ 0	$ 6,721	$ 0	$ 6,721
Exercise of pre-funded warrants for common stock (in shares)																0	387,019
Exercise of pre-funded warrants for common stock																$ 0	$ 0	0	0	0
Issuance of common stock upon vesting of restricted stock units (in shares)																0	8,590
Issuance of common stock upon vesting of restricted stock units																$ 0	$ 0	0	0	0
Conversion of preferred stock into common stock (in shares)																(7,600)	950,000
Conversion of preferred stock into common stock																$ 0	$ 1	0	0	1
Reclassifications and adjustments due to rounding impact from reverse stock split for fractional shares (in shares)																0	26,169
Reclassifications and adjustments due to rounding impact from reverse stock split for fractional shares																$ 0	$ (92)	92	0	0
Balance (in shares) at Sep. 30, 2022																56,451	7,435,644
Balance at Sep. 30, 2022																$ 0	$ 7	403,133	(398,194)	4,946
Balance (in shares) at Jun. 30, 2022																56,451	6,081,333
Balance at Jun. 30, 2022																$ 0	$ 6	399,422	(394,107)	5,321
Employee stock-based compensation																0	0	39	0	39
Accretion of Series A preferred stock dividends																0	0	(1,127)	0	(1,127)
Net and comprehensive loss																$ 0	$ 0	0	(4,087)	(4,087)
Issuance of common stock in public offerings, net of commissions and issuance costs (in shares)	0	959,137
Issuance of common stock in public offerings, net of commissions and issuance costs	$ 0	$ 1	$ 4,799	$ 0	$ 4,800
Exercise of pre-funded warrants for common stock (in shares)																0	387,019
Exercise of pre-funded warrants for common stock																$ 0	$ 0	0	0	0
Issuance of common stock upon vesting of restricted stock units (in shares)																0	8,155
Issuance of common stock upon vesting of restricted stock units																$ 0	$ 0	0	0	0
Balance (in shares) at Sep. 30, 2022																56,451	7,435,644
Balance at Sep. 30, 2022																$ 0	$ 7	$ 403,133	$ (398,194)	$ 4,946

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities
Net loss	$ (13,441)	$ (12,416)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	133	525
Amortization of debt issuance costs and debt discount	63	65
Stock-based compensation	127	960
Noncash interest expense and other charges	1,318	1,151
Change in right of use asset	72	102
Provision for excess and obsolete inventories	156	97
Other non-cash charges	37	3
Gain on extinguishment of debt	0	(2,353)
Changes in operating assets and liabilities:
Accounts receivable	(198)	82
Inventories	(1,182)	(733)
Prepaid expenses and other current assets	(352)	(318)
Other assets	15	(44)
Accounts payable	(783)	484
Accrued compensation	(265)	(324)
Accrued expenses and other current liabilities	(49)	122
Other long-term liabilities	306	431
Net cash used in operating activities	(14,043)	(12,166)
Cash flows from investing activities
Purchase of property and equipment	(31)	(18)
Net cash used in investing activities	(31)	(18)
Cash flows from financing activities
Net cash provided by financing activities	11,919	13,077
Net change in cash and cash equivalents	(2,155)	893
Cash and cash equivalents, beginning of period	19,497	22,185
Cash and cash equivalents, end of period	17,342	23,078
Noncash investing and financing activities:
Accretion of Series A preferred stock dividends	3,381	3,132
Reclassification of right of use asset to prepaid rent	(72)	(102)
Transfers between inventory and property and equipment	580	(7)
Common Stock [Member]
Cash flows from financing activities
Proceeds from the issuance of convertible preferred stock, net of commissions and issuance costs	6,721	0
Preferred Stock [Member]
Cash flows from financing activities
Proceeds from the issuance of convertible preferred stock, net of commissions and issuance costs	$ 5,198	$ 13,077

Note 1 - Organization

Note 1 - Organization	9 Months Ended
	Sep. 30, 2022
Notes to Financial Statements
Nature of Operations [Text Block]	1. Organization, Nature of Business Avinger, Inc. (the “Company”), a Delaware corporation, was incorporated in March 2007. “OCT”) Liquidity Matters In the course of its activities, the Company has incurred losses and negative cash flows from operations since its inception. As of September 30, 2022, September 30, 2022 fourth 2023. August 2022, nine September 30, 2022, January 2022 February 2021. may The Company can provide no not may twelve no 19 If the Company is unable to raise additional capital in sufficient amounts or on terms acceptable to it, the Company may one not Public Offerings Past Offerings On February 2, 2021, January 2022 On January 14, 2022, “January 2022 The 807,500 Common Warrants have an exercise price of $9.60 per share and became exercisable beginning July 14, 2022. five July 14, 2027. five January 2022 January 12, 2027. August 2022 On August 4, 2022, “August 2022 As a result, in the Registered Direct offering, the Company issued (i) 700,000 shares of common stock, (ii) and pre-funded warrants in lieu of common stock to purchase up to an aggregate of 784,019 shares of common stock (the “RD Pre-Funded Warrants”) and in the Private Placement, the Company issued pre-funded warrants to purchase up to an aggregate of 1,369,864 shares of common stock (the “Private Pre-Funded Warrants” and together with the RD Pre-Funded Warrants the “August 2022 In addition, the Company issued to the investor in the August 2022 five one February 8, 2028, two August 8, 2024. five August 2022 August 3, 2027. At The Market Offering Agreement On May 20, 2022, may 3, March 29, 2022 April 7, 2022, May 20, 2022. September 30, 2022, nine September 30, 2022, not August 3, 2022, may no

Note 2 - Summary of Significant

Note 2 - Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2022
Notes to Financial Statements
Basis of Presentation and Significant Accounting Policies [Text Block]	2. Basis of Presentation The accompanying unaudited condensed financial statements have been prepared in accordance with United States generally accepted accounting principles (“U.S. GAAP”) and pursuant to the rules and regulations of the SEC (“SEC”). The accompanying unaudited condensed interim financial statements have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the Company’s financial information. The results for the three nine September 30, 2022 not December 31, 2022, December 31, 2021 10 December 31, 2021, March 22, 2022. 2 10 December 31, 2021. On March 11, 2022, 1 March 14, 2022. not 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 and disclosures reported in the financial statements. Management uses significant judgment when making estimates related to its stock-based compensation, accruals related to compensation, the valuation of the common stock warrants, provisions for doubtful accounts receivable and excess and obsolete inventories, clinical trial accruals, and its reserves for sales returns and warranty costs. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not may may Concentration of Credit Risk, and Other Risks and Uncertainties Financial instruments that potentially subject the Company to credit risk consist of cash and cash equivalents and accounts receivable to the extent of the amounts recorded on the balance sheets. The Company’s policy is to invest in cash and cash equivalents, consisting of money market funds. These financial instruments are held in Company accounts at one The Company provides for uncollectible amounts when specific credit problems arise. Management’s estimates for uncollectible amounts have been adequate, and management believes that all significant credit risks have been identified at September 30, 2022 December 31, 2021. The Company’s accounts receivable are due from a variety of healthcare organizations in the United States and select international markets. At September 30, 2022, one December 31, 2021, three nine September 30, 2022, three nine September 30, 2021, The Company believes COVID- 19 The Company is closely monitoring general economic conditions on global supply chain, manufacturing, and logistics operations. As inflationary pressures increase, the Company anticipates that its production and operating costs may Product Warranty Costs The Company typically offers a one Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Beginning balance $ 137 $ 231 $ 187 $ 193 Warranty provision 6 5 10 46 Usage/Release (34 ) (40 ) (88 ) (43 ) Ending balance $ 109 $ 196 $ 109 $ 196 Net Loss per Share Attributable to Common Stockholders Basic net loss per share attributable to common stockholders is computed by dividing the net loss applicable to common stockholders by the weighted average number of shares of common stock outstanding during the period, without consideration for potential dilutive common shares. Diluted net loss per share attributable to common stockholders is computed by dividing the net loss applicable to common stockholders by the weighted average number of shares of common stock and dilutive potential shares of common stock outstanding during the period. Any common stock shares subject to repurchase are excluded from the calculations as the continued vesting of such shares is contingent upon the holders’ continued service to the Company. As of September 30, 2022 2021, no Net loss per share attributable to common stockholders was determined as follows (in thousands, except per share data): Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Net loss applicable to common stockholders $ (5,214 ) $ (5,956 ) $ (21,933 ) $ (15,548 ) Weighted average common stock outstanding, basic and diluted 6,798 4,769 5,804 4,704 Net loss per share attributable to common stockholders, basic and diluted $ (0.77 ) $ (1.25 ) $ (3.78 ) $ (3.31 ) The following potentially dilutive securities outstanding have been excluded from the computations of diluted weighted average shares outstanding because such securities have an anti-dilutive impact due to losses reported: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Common stock warrants equivalents 5,541,377 134,109 2,490,263 136,489 Common stock options 303 303 303 285 Convertible preferred stock 56,451 52,276 58,562 52,293 Unvested restricted stock units 7,230 18,986 8,718 20,401 5,605,361 205,674 2,557,846 209,468 Segment and Geographical Information The Company operates and manages its business as one three September 30, 2022 2021, nine September 30, 2022 2021, As of September 30, 2022 December 31, 2021, 1 September 30, 2022 December 31, 2021, no 2 3. no three nine September 30, 2022. Recent Accounting Pronouncements Recently adopted accounting standards In May 2021, No. 2021 04, Issuer s Accounting for Certain Modifications of Exchanges of Freestanding Equity-Classified Written Call Options January 1, 2022. not Recent accounting standards not In August 2020, No. 2020 06, Debt Debt with Conversion and Other Options (Subtopic 470 20 Contracts in Entity s Own Equity (Subtopic 815 40 s Own Equity not 815 first 2024 not

Note 3 - Inventories

Note 3 - Inventories	9 Months Ended
	Sep. 30, 2022
Notes to Financial Statements
Inventory Disclosure [Text Block]	3. Inventories consisted of the following (in thousands): September 30, December 31, 2022 2021 Raw materials $ 2,863 $ 2,503 Work-in-process 333 1 Finished products 1,851 2,097 Total inventories $ 5,047 $ 4,601

Note 4 - Borrowings

Note 4 - Borrowings	9 Months Ended
	Sep. 30, 2022
Notes to Financial Statements
Debt Disclosure [Text Block]	4. CRG On September 22, 2015, March 29, 2017. September 22, 2015. June 15, 2016 On February 14, 2018, The Company has entered into several amendments to the Loan Agreement (the “Amendments”) with CRG since September 2015, August 10, 2022. 1 December 31, 2023; 2 may December 31, 2023 no 3 December 31, 2023 no 4 December 31, 2025; ( 5 6 2018, 2019 2020; 7 $8 2022, 8 2023, 2024 2025; 9 no December 31, 2020; ( 10 19 not 11 Under the amended Loan Agreement, no first 2024. not first 2024, 2024 2025. December 31, 2025. The Company may no seven The Loan Agreement requires that the Company adheres to certain affirmative and negative covenants, including financial reporting requirements, certain minimum financial covenants for pre-specified liquidity and revenue requirements and a prohibition against the incurrence of indebtedness, or creation of additional liens, other than as specifically permitted by the terms of the Loan Agreement. In particular, the covenants of the amended Loan Agreement included a covenant that the Company maintain a minimum of $3.5 million of cash and certain cash equivalents, and the Company has to achieve certain minimum revenues. If the Company fails to meet the applicable minimum revenue target in any calendar year, the Loan Agreement provides the Company with a cure right if it prepays a portion of the outstanding principal equal to 2.0 times the revenue shortfall. In addition, the Loan Agreement prohibits the payment of cash dividends on the Company’s capital stock and also places restrictions on mergers, sales of assets, investments, incurrence of liens, incurrence of indebtedness and transactions with affiliates. CRG may As of September 30, 2022, As of September 30, 2022, Year Ending December 31, 2022 (remaining three months of the year) $ — 2023 — 2024 9,045 2025 10,339 19,384 Less: Amount of PIK additions and final facility fee to be incurred subsequent to September 30, 2022 (5,446 ) Less: Amount representing debt issuance costs (270 ) Borrowings, long term portion, as of September 30, 2022 $ 13,668 In connection with drawdowns under the Loan Agreement, the Company recorded aggregate debt discounts of $1.3 million as contra-debt. The debt discounts are being amortized as non-cash interest expense using the effective interest method over the term of the Loan Agreement. As of September 30, 2022 December 31, 2021, three September 30, 2022 2021, nine September 30, 2022 2021, three September 30, 2022 2021, nine September 30, 2022 2021, As of September 30, 2022, Paycheck Protection Program On April 23, 2020, The PPP Loan, which was in the form of a promissory note, dated April 20, 2020 ( April 20, 2022 1% six no The PPP Loan was administered by the U.S. Small Business Administration (“SBA”). The SBA was given the authority under the PPP to forgive loans if all employees were kept on the payroll for a required period and the loan proceeds were used for payroll, rent and utilities. The Company applied for debt forgiveness in December 2020. On April 17, 2021, no April 2021 nine September 30, 2021,

Note 5 - Leases

Note 5 - Leases	9 Months Ended
	Sep. 30, 2022
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	5. The Company’s operating lease obligations primarily consist of leased office, laboratory, and manufacturing space under a non-cancelable operating lease. In addition to the minimum future lease commitments presented below, the lease requires the Company to pay property taxes, insurance, maintenance, and repair costs. The lease includes a rent holiday concession and escalation clauses for increased rent over the lease term. Rent expense is recognized using the straight-line method over the term of the lease. The Company records deferred rent calculated as the difference between rent expense and the cash rental payments. The lease will expire on November 30, 2024. November 2024, December 1, 2019. September 30, 2022 The operating lease was included on the balance sheet at the present value of the future base payments discounted at a 6.5% discount rate using the rate of interest that the Company would have to pay to borrow on a collateralized basis over a similar term and amount equal to the lease payments in a similar economic environment as the lease does provide an implicit rate. The Company’s operating lease expense, excluding variable maintenance fees and other expenses on a monthly basis, was approximately $105,000. Rent expense for both the three September 30, 2022 2021 nine September 30, 2022 2021 three September 30, 2022 2021 nine September 30, 2022 2021 three September 30, 2022 2021 nine September 30, 2022 2021 September 30, 2022 December 31, 2022, The following table presents the future operating leasehold payments and lease liability included on the balance sheet related to the Company’s operating lease as of September 30, 2022 ( Year Ending December 31, 2022 (remaining three months of the year) $ 293 2023 1,203 2024 1,138 2,634 Less: Imputed interest (185 ) Leasehold liability as of September 30, 2022 $ 2,449 The following table shows right of use (“ROU”) assets and lease liabilities, and the associated financial statement line items, as of September 30, 2022 December 31, 2021 ( Lease-Related Assets and Liabilities Financial Statement Line Items September 30, 2022 December 31, 2021 Right of use assets: Operating lease Right of use asset $ 2,449 $ 3,179 Total right of use assets $ 2,449 $ 3,179 Lease liabilities: Operating lease Leasehold liability, current portion $ 1,065 $ 985 Leasehold liability, long-term portion 1,384 2,194 Total lease liabilities $ 2,449 $ 3,179

Note 6 - Commitments and Contin

Note 6 - Commitments and Contingencies	9 Months Ended
	Sep. 30, 2022
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	6. Purchase Obligations Purchase obligations consist of agreements to purchase goods and services entered into in the ordinary course of business. The Company had non-cancelable commitments to suppliers for purchases totaling approximately $1.5 million as of September 30, 2022. Legal Proceedings The Company is not may

Note 7 - Stockholders' Equity

Note 7 - Stockholders' Equity	9 Months Ended
	Sep. 30, 2022
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	7. Equity Convertible Preferred Stock As of September 30, 2022 December 31, 2021, September 30, 2022 December 31, 2021, Series A Convertible Preferred Stock The holders of Series A preferred stock are entitled to receive annual accruing dividends at a rate of 8%, payable in additional shares of Series A preferred stock or cash, at the Company’s option. The shares of Series A preferred stock have a liquidation preference of $1,000 per share, no December 31, 2021, September 30, 2022 December 31, 2021, September 30, 2022 2021, nine September 30, 2022 2021, Series B Convertible Preferred Stock The Series B preferred stock has a liquidation preference of $0.001 per share, full ratchet price based anti-dilution protection, has no no not December 31, 2021, September 30, 2022 December 31, 2021, Series D Convertible Preferred Stock On January 14, 2022, “January 2022 $1,000 nine September 30, 2022, no September 30, 2022. At the time of issuance, the Company evaluated the classification of the Series D preferred stock and determined equity classification was appropriate due to no first The embedded conversion feature was evaluated and bifurcation from the preferred stock equity host was not March 14, 2022, one nine September 30, 2022. Common Stock As of September 30, 2022, Common Stock Warrants As of December 31, 2021, Total Outstanding and Exercisable Underlying Shares of Common Stock Exercise Price per Share Expiration Date Series 1 Warrants issued in the February 2018 Series B financing 8,979,000 44,895 $ 400.00 February 2025 Series 2 Warrants issued in the February 2018 Series B financing 8,709,500 43,548 $ 400.00 February 2025 Warrants issued in the November 2018 financing 8,768,395 43,842 $ 80.00 November 2023 Total as of December 31, 2021 26,456,895 132,265 As of September 30, 2022, Total Outstanding and Exercisable Underlying Shares of Common Stock Exercise Price per Share Expiration Date Series 1 Warrants issued in the February 2018 Series B financing 8,979,000 44,895 $ 400.00 February 2025 Series 2 Warrants issued in the February 2018 Series B financing 8,709,500 43,548 $ 400.00 February 2025 Warrants issued in the November 2018 financing 8,768,395 43,842 $ 80.00 November 2023 Placement agent warrants issued in the January 2022 financing 1,330,000 66,500 $ 10.00 January 2027 Warrants issued in the January 2022 financing 16,150,000 807,500 $ 9.60 July 2027 Pre-funded warrants issued in the August 2022 financing 1,766,864 1,766,864 $ 0.0001 n/a Series A Private Investment Options issued in August 2022 financing 2,853,883 2,853,883 $ 1.502 February 2028 Series B Private Investment Options issued in August 2022 financing 2,853,883 2,853,883 $ 1.502 August 2024 Placement agent Private Investment Options issued in the August 2022 financing 171,233 171,233 $ 2.19 August 2027 Total as of September 30, 2022 51,582,758 8,652,148 January 2022 Pursuant to a purchase agreement entered into on January 14, 2022, July 14, 2022. five July 14, 2027. The Company issued to the placement agent of the January 2022 five January 2022 January 12, 2027. August 2022 Pursuant to a purchase agreement entered into on August 4, 2022, August 2022 no three September 30, 2022, September 30, 2022, The Company issued Series A preferred investment options to purchase up to 2,853,883 additional shares of the Company’s common stock and Series B preferred investment options to purchase up to 2,853,883 additional shares of the Company’s common stock, collectively referred to as Preferred Investment Options. The Series A preferred investment options have an exercise price of $1.502 per share, are immediately exercisable, and will expire five one February 8, 2028, two August 8, 2024. The Company issued to the placement agent of the August 2022 five August 2022 August 3, 2027. The exercise price and the number of shares of common stock issuable upon exercise of each Common Warrants, Pre-Funded Warrants, Preferred Investment Options, and Placement Agent Preferred Investment Options are subject to appropriate adjustments in the event of certain stock dividends and distributions, stock splits, stock combinations, reclassifications or similar events affecting the common stock. In addition, in certain circumstances, upon a fundamental transaction, a holder of Common Warrants, Pre-Funded Warrants, Preferred Investment Options, or Placement Agent Preferred Investment Options will be entitled to receive, upon exercise, the kind and amount of securities, cash or other property that such holder would have received had they exercised the Common Warrants, Pre-Funded Warrants, Preferred Investment Options, or Placement Agent Preferred Investment Options immediately prior to the fundamental transaction. The Common Warrants, Pre-Funded Warrants, Preferred Investment Options, and Placement Agent Preferred Investment Options can be exercised at the option of the holders at any time after they become exercisable provided that shares of the Common Warrants, Pre-Funded Warrants, Preferred Investment Options, or Placement Agent Preferred Investment Options cannot be exercised into common stock if the applicable holder would beneficially own in excess of 4.99% (or, upon election by such holder prior to the issuance of any shares of Common Warrants, Pre-Funded Warrants, Preferred Investment Options, or Placement Agent Preferred Investment Options, 9.99%) of the Company’s outstanding common stock immediately after giving effect to the exercise. A holder of the Common Warrants, Pre-Funded Warrants, Preferred Investment Options or Placement Agent Preferred Investment Options may, not 9.99%. In the event of a fundamental transaction in which the holders of our voting securities immediately prior to such fundamental transaction will not, 50% not not not As of September 30, 2022 December 31, 2021, Stock Plans In January 2015, 2015 “2015 October 14, 2022, 2015 September 30, 2022, 2015 The Company’s RSUs generally vest annually over three Number of Shares Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Term Awards outstanding at December 31, 2021 10,060 $ 24.39 0.72 Awarded — $ — — Released (8,590 ) $ 25.02 — Forfeited (1,053 ) $ 24.25 — Awards outstanding at September 30, 2022 417 $ 11.64 0.42 As of September 30, 2022, September 30, 2022, nine September 30, 2022 2021, three September 30, 2022 2021, nine September 30, 2022 2021 2018 There was no common stock issued under the Company’s Officer and Director Share Purchase Plan (“ODPP”) during either the nine September 30, 2022 2021. May 16, 2022, no

Note 8 - Stock-based Compensati

Note 8 - Stock-based Compensation	9 Months Ended
	Sep. 30, 2022
Notes to Financial Statements
Share-Based Payment Arrangement [Text Block]	8. Total noncash stock-based compensation expense relating to the Company’s stock options and RSUs recognized during the three nine September 30, 2022 2021, Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Cost of revenues $ 4 $ 24 $ 18 $ 93 Research and development expenses 11 78 37 274 Selling, general and administrative expenses 24 137 72 593 $ 39 $ 239 $ 127 $ 960

Note 9 - Subsequent Events

Note 9 - Subsequent Events	9 Months Ended
	Sep. 30, 2022
Notes to Financial Statements
Subsequent Events [Text Block]	9. On October 14, 2022, 2022 “2022 2015 2015 2015 2015 April 5, 2022. 2015 October 14, 2022. 2015 2015

Note 2 - Summary of Significa_2

Note 2 - Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2022
Notes Tables
Schedule of Product Warranty Liability [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Beginning balance $ 137 $ 231 $ 187 $ 193 Warranty provision 6 5 10 46 Usage/Release (34 ) (40 ) (88 ) (43 ) Ending balance $ 109 $ 196 $ 109 $ 196
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Net loss applicable to common stockholders $ (5,214 ) $ (5,956 ) $ (21,933 ) $ (15,548 ) Weighted average common stock outstanding, basic and diluted 6,798 4,769 5,804 4,704 Net loss per share attributable to common stockholders, basic and diluted $ (0.77 ) $ (1.25 ) $ (3.78 ) $ (3.31 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Common stock warrants equivalents 5,541,377 134,109 2,490,263 136,489 Common stock options 303 303 303 285 Convertible preferred stock 56,451 52,276 58,562 52,293 Unvested restricted stock units 7,230 18,986 8,718 20,401 5,605,361 205,674 2,557,846 209,468

Note 3 - Inventories (Tables)

Note 3 - Inventories (Tables)	9 Months Ended
	Sep. 30, 2022
Notes Tables
Schedule of Inventory, Current [Table Text Block]	September 30, December 31, 2022 2021 Raw materials $ 2,863 $ 2,503 Work-in-process 333 1 Finished products 1,851 2,097 Total inventories $ 5,047 $ 4,601

Note 4 - Borrowings (Tables)

Note 4 - Borrowings (Tables)	9 Months Ended
	Sep. 30, 2022
Notes Tables
Schedule of Debt [Table Text Block]	Year Ending December 31, 2022 (remaining three months of the year) $ — 2023 — 2024 9,045 2025 10,339 19,384 Less: Amount of PIK additions and final facility fee to be incurred subsequent to September 30, 2022 (5,446 ) Less: Amount representing debt issuance costs (270 ) Borrowings, long term portion, as of September 30, 2022 $ 13,668

Note 5 - Leases (Tables)

Note 5 - Leases (Tables)	9 Months Ended
	Sep. 30, 2022
Notes Tables
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Year Ending December 31, 2022 (remaining three months of the year) $ 293 2023 1,203 2024 1,138 2,634 Less: Imputed interest (185 ) Leasehold liability as of September 30, 2022 $ 2,449
Right of Use Asset and Liabilities [Table Text Block]	Lease-Related Assets and Liabilities Financial Statement Line Items September 30, 2022 December 31, 2021 Right of use assets: Operating lease Right of use asset $ 2,449 $ 3,179 Total right of use assets $ 2,449 $ 3,179 Lease liabilities: Operating lease Leasehold liability, current portion $ 1,065 $ 985 Leasehold liability, long-term portion 1,384 2,194 Total lease liabilities $ 2,449 $ 3,179

Note 7 - Stockholders' Equity (

Note 7 - Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2022
Notes Tables
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]	Total Outstanding and Exercisable Underlying Shares of Common Stock Exercise Price per Share Expiration Date Series 1 Warrants issued in the February 2018 Series B financing 8,979,000 44,895 $ 400.00 February 2025 Series 2 Warrants issued in the February 2018 Series B financing 8,709,500 43,548 $ 400.00 February 2025 Warrants issued in the November 2018 financing 8,768,395 43,842 $ 80.00 November 2023 Total as of December 31, 2021 26,456,895 132,265 Total Outstanding and Exercisable Underlying Shares of Common Stock Exercise Price per Share Expiration Date Series 1 Warrants issued in the February 2018 Series B financing 8,979,000 44,895 $ 400.00 February 2025 Series 2 Warrants issued in the February 2018 Series B financing 8,709,500 43,548 $ 400.00 February 2025 Warrants issued in the November 2018 financing 8,768,395 43,842 $ 80.00 November 2023 Placement agent warrants issued in the January 2022 financing 1,330,000 66,500 $ 10.00 January 2027 Warrants issued in the January 2022 financing 16,150,000 807,500 $ 9.60 July 2027 Pre-funded warrants issued in the August 2022 financing 1,766,864 1,766,864 $ 0.0001 n/a Series A Private Investment Options issued in August 2022 financing 2,853,883 2,853,883 $ 1.502 February 2028 Series B Private Investment Options issued in August 2022 financing 2,853,883 2,853,883 $ 1.502 August 2024 Placement agent Private Investment Options issued in the August 2022 financing 171,233 171,233 $ 2.19 August 2027 Total as of September 30, 2022 51,582,758 8,652,148
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]	Number of Shares Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Term Awards outstanding at December 31, 2021 10,060 $ 24.39 0.72 Awarded — $ — — Released (8,590 ) $ 25.02 — Forfeited (1,053 ) $ 24.25 — Awards outstanding at September 30, 2022 417 $ 11.64 0.42

Note 8 - Stock-based Compensa_2

Note 8 - Stock-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2022
Notes Tables
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Cost of revenues $ 4 $ 24 $ 18 $ 93 Research and development expenses 11 78 37 274 Selling, general and administrative expenses 24 137 72 593 $ 39 $ 239 $ 127 $ 960

Note 1 - Organization (Details

Note 1 - Organization (Details Textual) - USD ($)				1 Months Ended			3 Months Ended	9 Months Ended
	Aug. 04, 2022	Jan. 14, 2022	Feb. 02, 2021	Aug. 31, 2022	Jan. 31, 2022	Feb. 28, 2021	Sep. 30, 2022	Sep. 30, 2022	May 20, 2022	Dec. 31, 2021
Retained Earnings (Accumulated Deficit), Total							$ (398,194,000)	$ (398,194,000)		$ (384,753,000)
Cash and Cash Equivalents, at Carrying Value, Total							$ 17,342,000	$ 17,342,000		$ 19,497,000
Share Price (in dollars per share)							$ 1.15	$ 1.15
Preferred Stock, Par or Stated Value Per Share (in dollars per share)							$ 0.001	$ 0.001		$ 0.001
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							8,652,148	8,652,148		132,265
Class of Warrant or Right, Outstanding (in shares)							51,582,758	51,582,758		26,456,895
Common Stock, Par or Stated Value Per Share (in dollars per share)							$ 0.001	$ 0.001		$ 0.001
Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		807,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 9.60
Warrants and Rights Outstanding, Term (Year)		5 years
Placement agent warrants issued in the January 2022 financing [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							66,500	66,500
Class of Warrant or Right, Outstanding (in shares)							1,330,000	1,330,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 10	$ 10
Registered Direct Pre-funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	784,019
Series A Preferred Investment Options [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				2,853,883
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 1.502
Warrants and Rights Outstanding, Term (Year)				5 years 6 months
Series B Preferred Investment Options [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				2,853,883
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 1.502
Warrants and Rights Outstanding, Term (Year)				2 years
Placement Agent Preferred Investment Options [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				171,233
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 2.19
Warrants and Rights Outstanding, Term (Year)				5 years
Series D Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001
Series D Preferred Stock [Member] | Common Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)		807,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 9.60
Warrants and Rights Outstanding, Term (Year)		5 years
Series D Preferred Stock [Member] | Placement agent warrants issued in the January 2022 financing [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		66,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 10
Warrants and Rights Outstanding, Term (Year)		5 years
August 2022 Public Offering [Member]
Proceeds from Issuance or Sale of Equity, Net				$ 4,400,000
The Market Offering Agreement (the “ATM Agreement”) [Member]
Proceeds from Issuance or Sale of Equity, Net								$ 800,000
Stock Issued During Period, Shares, New Issues (in shares)								585,603
Shares Issued, Price Per Share (in dollars per share)							$ 1.67	$ 1.67
Proceeds from Issuance or Sale of Equity, Total								$ 1,000,000
Proceeds from Commissions Received								$ 29,000
January 2022 Public Offering [Member]
Proceeds from Issuance or Sale of Equity, Net		$ 6,700,000			$ 6,700,000
January 2022 Public Offering [Member] | Series D Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)		7,600
Shares Issued, Price Per Share (in dollars per share)		$ 1,000
Preferred Stock, Convertible, Conversion Price (in dollars per share)		$ 8
February 2021 Public Offering [Member]
Proceeds from Issuance or Sale of Equity, Net			$ 13,000,000			$ 13,000,000
Stock Issued During Period, Shares, New Issues (in shares)			500,000
Share Price (in dollars per share)			$ 28.80
August 2022 Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	700,000
Shares Issued, Price Per Share (in dollars per share)	$ 1.752
Sale of Stock, Number of Shares (in shares)	1,484,019
Proceeds from Issuance or Sale of Equity, Total	$ 4.4
Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,369,864
Shares Issued, Price Per Share (in dollars per share)	$ 1.752
Private Placement [Member] | Registered Direct Pre-funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	1,369,864
Common Stock in June, 2022 [Member]
Stock Issued During Period, Shares, New Issues (in shares)							259,137
Shares Issued, Price Per Share (in dollars per share)							$ 1.56	$ 1.56
Proceeds from Issuance or Sale of Equity, Total							$ 400,000
Common Stock, Par or Stated Value Per Share (in dollars per share)									$ 0.001
Share Offering Agreement, Aggregate Offering									$ 7,000,000
Commission Percentage									3%
Payments of Stock Issuance Costs							$ 12,000

Note 2 - Summary of Significa_3

Note 2 - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 11, 2022	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Number of Reportable Segments					1
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers					1		1
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage					11%		21%
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers			1	0		0
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Concentration Risk, Percentage		95%		94%	93%	94%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]
Concentration Risk, Percentage		11%			13%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Zero Customer [Member]
Concentration Risk, Percentage					10%
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	20

Note 2 - Summary of Significa_4

Note 2 - Summary of Significant Accounting Policies - Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Beginning balance	$ 137	$ 231	$ 187	$ 193
Warranty provision	6	5	10	46
Usage/Release	(34)	(40)	(88)	(43)
Ending balance	$ 109	$ 196	$ 109	$ 196

Note 2 - Summary of Significa_5

Note 2 - Summary of Significant Accounting Policies - Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net loss applicable to common stockholders	$ (5,214)	$ (5,956)	$ (21,933)	$ (15,548)
Weighted average common stock outstanding, basic and diluted (in shares)	6,798	4,769	5,804	4,704
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.77)	$ (1.25)	$ (3.78)	$ (3.31)

Note 2 - Summary of Significa_6

Note 2 - Summary of Significant Accounting Policies - Anti-dilutive Securities (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Antidilutive Securities (in shares)	5,605,361	205,674	2,557,846	209,468
Common Stock Warrants [Member]
Antidilutive Securities (in shares)	5,541,377	134,109	2,490,263	136,489
Common Stock Options [ member]
Antidilutive Securities (in shares)	303	303	303	285
Preferred Stock [Member]
Antidilutive Securities (in shares)	56,451	52,276	58,562	52,293
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities (in shares)	7,230	18,986	8,718	20,401

Note 3 - Inventories - Schedule

Note 3 - Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Raw materials	$ 2,863	$ 2,503
Work-in-process	333	1
Finished products	1,851	2,097
Total inventories	$ 5,047	$ 4,601

Note 4 - Borrowings (Details Te

Note 4 - Borrowings (Details Textual) - USD ($)				1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 22, 2021	Apr. 23, 2020	Feb. 14, 2018	Apr. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Aug. 10, 2022	Dec. 31, 2021	Apr. 17, 2021	Jun. 15, 2016	Sep. 22, 2015
Gain (Loss) on Extinguishment of Debt, Total							$ 0	$ 2,353,000
Interest Expense, Total					$ 407,000	$ 419,000	1,286,000	1,214,000
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Long-term Debt, Total		$ 2,300,000
Long-term Debt, Total											$ 0
Debt Instrument Interest Forgiven				$ 23,000
Interest Expense, Total								7,000
Paycheck Protection Program CARES Act [Member] | Other Nonoperating Income (Expense) [Member]
Gain (Loss) on Extinguishment of Debt, Total				$ 2,400,000
CRG [Member] | Loan Agreement [Member]
Debt Agreement, Maximum Borrowing Capacity													$ 50,000,000
Debt Instrument, Covenant Compliance, Minimum Liquidity Requirement									$ 3,500,000
Debt Instrument, Covenant Compliance, Target Minimum Revenue, Past Twelve Months									10,000,000
Debt Instrument, Covenant Compliance Target Minimum Revenue Third Year									14,500,000
Debt Instrument, Covenant Compliance Target Minimum Revenue Fourth Year									$ 17,000,000
Debt Instrument, Interest Rate, Stated Percentage									12.50%
Debt Instrument, Periodic Payment, Total	$ 1,900,000
Long-Term Debt, Maturity, Year Four	7,500,000
Long-Term Debt, Maturity, Year Five	$ 7,500,000
Debt Instrument, Redemption Initial Prepayment Premium Percentage	5%
Debt Instrument, Redemption Annual Decline in Prepayment Premium Percentage	1%
Debt Instrument, Redemption Prepayment Premium Percentage after Fifth Year	0%
Debt Instrument, Financing Fee Percentage	1.50%
Debt Instrument, Final Facility Fee Percentage	15%
Debt Instrument, Covenant Compliance Cash and Certain Cash Equivalents Minimum	$ 3,500,000
Debt Instrument, Covenant Compliance Prepayment Multiplier for Revenue Shortfall	2
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Total					270,000		270,000			$ 333,000			1,300,000
Amortization of Debt Discount (Premium)					21,000		63,000	65,000
Interest Expense, Debt, Total					$ 480,000	$ 419,000	$ 1,400,000	$ 1,200,000
CRG [Member] | Loan Agreement [Member] | Series A Preferred Stock Purchase Agreement with CRG [Member]
Debt Conversion, Original Debt, Amount			$ 38,000,000
Debt Conversion, Fees and Prepayment Premium Amount			$ 3,800,000
CRG [Member] | Loan Agreement [Member] | First Tranche, Borrowed on September 22, 2015 [Member]
Debt Instrument, Face Amount													$ 30,000,000
CRG [Member] | Loan Agreement [Member] | Second Tranche, Borrowed on June 15, 2016 [Member]
Debt Instrument, Face Amount												$ 10,000,000

Note 4 - Borrowings - Schedule

Note 4 - Borrowings - Schedule of Debt (Details) - Loan Agreement [Member] - CRG [Member] $ in Thousands	Sep. 30, 2022 USD ($)
2022 (remaining three months of the year)	$ 0
2023	0
2024	9,045
2025	10,339
Long-Term Debt, Total	19,384
Less: Amount of PIK additions and final facility fee to be incurred subsequent to September 30, 2022	(5,446)
Less: Amount representing debt issuance costs	(270)
Borrowings, long term portion, as of September 30, 2022	$ 13,668

Note 5 - Leases (Details Textua

Note 5 - Leases (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Apr. 01, 2019
Lessee, Operating Lease, Liability, Payments, Due, Total	$ 2,634,000		$ 2,634,000			$ 5,800,000
Operating Lease, Weighted Average Remaining Lease Term (Year)	2 years 2 months 12 days		2 years 2 months 12 days
Lessee, Operating Lease, Discount Rate					6.50%
Operating Lease, Expense, Excluding Maintenance Fee and Other Expense, Monthly			$ 105,000
Operating Lease, Expense	$ 314,000	$ 314,000	942,000	$ 942,000
Variable Lease, Cost	63,000	59,000	200,000	177,000
Operating Lease, Right-of-Use Asset, Amortization Expense	271,000	$ 256,000	802,000	$ 758,000
Prepaid Rent	$ 86,000		$ 86,000		$ 158,000

Note 5 - Leases - Future Operat

Note 5 - Leases - Future Operating Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Apr. 01, 2019
2022 (remaining nine months of the year), future operating lease payments	$ 293
2023, future operating lease payments	1,203
2024, future operating lease payments	1,138
Total, future operating lease payments	2,634		$ 5,800
Less: Imputed interest	(185)
Leasehold liability as of September 30, 2022	$ 2,449	$ 3,179

Note 5 - ROU Assets and Lease L

Note 5 - ROU Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Operating lease	$ 2,449	$ 3,179
Total right of use assets	2,449	3,179
Operating lease	1,065	985
Operating Lease, Liability, Noncurrent	1,384	2,194
Total lease liabilities	$ 2,449	$ 3,179

Note 6 - Commitments and Cont_2

Note 6 - Commitments and Contingencies (Details Textual) $ in Millions	Sep. 30, 2022 USD ($)
Purchase Commitment [Member]
Purchase Obligation, Total	$ 1.5

Note 7 - Stockholders' Equity_2

Note 7 - Stockholders' Equity (Details Textual)				3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 14, 2022 shares	Jan. 14, 2022 USD ($) $ / shares shares	Feb. 14, 2018	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) shares	Dec. 31, 2021 $ / shares shares	Aug. 31, 2022 $ / shares shares	Aug. 04, 2022 $ / shares shares	Feb. 16, 2018 $ / shares
Preferred Stock, Shares Authorized (in shares)				5,000,000		5,000,000		5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.001		$ 0.001		$ 0.001
Preferred Stock, Shares Issued (in shares)				56,451		56,451		56,451
Preferred Stock, Shares Outstanding, Ending Balance (in shares)				56,451		56,451		56,451
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				8,652,148		8,652,148		132,265
Preferred Stock Redemption Discount | $						$ 5,111,000
Common Stock, Shares Authorized (in shares)				100,000,000		100,000,000		100,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.001		$ 0.001		$ 0.001
Common Stock, Shares, Outstanding, Ending Balance (in shares)				7,435,644		7,435,644		4,778,263
Class of Warrant or Right, Outstanding (in shares)				51,582,758		51,582,758		26,456,895
Share Price (in dollars per share) | $ / shares				$ 1.15		$ 1.15
Share-Based Payment Arrangement, Expense | $				$ 39,000	$ 239,000	$ 127,000	$ 960,000
Common Stock, Shares, Issued (in shares)				7,435,644		7,435,644		4,778,263
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $				$ 100,000		$ 100,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)						4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Fair Value | $				100,000		$ 100,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $						14,000	0.3
Share-Based Payment Arrangement, Expense | $				$ 39,000	$ 0.2	$ 100,000	$ 1
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)						3 years
The 2015 Employee Stock Purchase Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)				9,566		9,566
The 2015 Employee Stock Purchase Plan [Member] | Subsequent Event [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	1,750,000
Officer and Director Share Purchase Plan [Member]
Common Stock, Shares, Issued (in shares)				0	0	0	0
Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input		5.5
Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input		136.61
Measurement Input, Discount Rate [Member]
Warrants and Rights Outstanding, Measurement Input		1.51
Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input		0
Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		807,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 9.60
Warrants and Rights Outstanding, Term (Year)		5 years
Common Stock Warrants, Issued with Series D Convertible Preferred Stock [Member]
Proceeds from Issuance of Warrants | $		$ 3,591
Placement agent warrants issued in the January 2022 financing [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				66,500		66,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 10		$ 10
Class of Warrant or Right, Outstanding (in shares)				1,330,000		1,330,000
Registered Direct Pre-funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)										784,019
Stock Issued During Period, Shares, Warrants Exercised (in shares)				387,019
Private Pre-funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)										1,369,864
Pre-funded Warrants Issued in August 2022 Financing [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				1,766,864		1,766,864
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 0.0001		$ 0.0001				$ 0.0001
Class of Warrant or Right, Outstanding (in shares)				1,766,864		1,766,864
Series A Preferred Investment Options [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									2,853,883
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares									$ 1.502
Warrants and Rights Outstanding, Term (Year)									5 years 6 months
Series B Financing Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									2,853,883
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares									$ 1.502
Warrants and Rights Outstanding, Term (Year)									2 years
Placement Agent Preferred Investment Options [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									171,233
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares									$ 2.19
Warrants and Rights Outstanding, Term (Year)									5 years
January 2022 Public Offering [Member]
Proceeds from Issuance of Convertible Preferred Stock | $		$ 4,009
Conversion of Series B Preferred Stock into Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)								93
Conversion of Stock, Shares Issued (in shares)								18,600
Series A Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance (in shares)				56,366		56,366		56,451
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares				$ 1,000		$ 1,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares				$ 400		$ 400
Dividends, Preferred Stock, Total | $				$ 1,100,000	$ 1,000,000	$ 3,400,000	$ 3,100,000
Series A Preferred Stock [Member] | CRG [Member]
Preferred Stock Dividends, Shares (in shares)								4,175
Series A Preferred Stock [Member] | Conversion of Principal Amount of Senior Secured Loan to Newly Authorized Series A Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage			8%
Series B Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares											$ 0.001
Preferred Stock, Shares Outstanding, Ending Balance (in shares)				85		85		85
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares				$ 5		$ 5		$ 5
Series D Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.001
Conversion of Stock, Shares Converted (in shares)						7,600
Conversion of Stock, Shares Issued (in shares)						950,000
Series D Preferred Stock [Member] | Common Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 9.60
Warrants and Rights Outstanding, Term (Year)		5 years
Class of Warrant or Right, Outstanding (in shares)		807,500
Series D Preferred Stock [Member] | Placement agent warrants issued in the January 2022 financing [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		66,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 10
Warrants and Rights Outstanding, Term (Year)		5 years
Series D Preferred Stock [Member] | January 2022 offering [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.001
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares		$ 8
Stock Issued During Period, Shares, New Issues (in shares)		7,600
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 1,000
Preferred Stock, Convertible, Shares Issuable (in shares)		950,000
Series D Preferred Stock [Member] | January 2022 offering [Member] | Common Warrants [Member]
Conversion of Warrants Allowed Maximum Ownership of Common Stock Percentage		4.99%
Conversion of Warrants Allowed Maximum Ownership of Common Stock Percentage upon Election		9.99%
Series D Preferred Stock [Member] | January 2022 Public Offering [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares		$ 8
Stock Issued During Period, Shares, New Issues (in shares)		7,600
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 1,000

Note 7 - Stockholder's Equity -

Note 7 - Stockholder's Equity - Outstanding Warrants (Details) - $ / shares	Sep. 30, 2022	Aug. 04, 2022	Dec. 31, 2021
Total outstanding and exercisable (in shares)	51,582,758		26,456,895
Underlying shares of common stock (in shares)	8,652,148		132,265
Series 1 February 2018 Warrants [Member]
Total outstanding and exercisable (in shares)	8,979,000		8,979,000
Underlying shares of common stock (in shares)	44,895		44,895
Exercise price per share (in dollars per share)	$ 400		$ 400
Series 2 February 2018 Warrants [Member]
Total outstanding and exercisable (in shares)	8,709,500		8,709,500
Underlying shares of common stock (in shares)	43,548		43,548
Exercise price per share (in dollars per share)	$ 400		$ 400
November 2018 Warrants [Member]
Total outstanding and exercisable (in shares)	8,768,395		8,768,395
Underlying shares of common stock (in shares)	43,842		43,842
Exercise price per share (in dollars per share)	$ 80		$ 80
Placement agent warrants issued in the January 2022 financing [Member]
Total outstanding and exercisable (in shares)	1,330,000
Underlying shares of common stock (in shares)	66,500
Exercise price per share (in dollars per share)	$ 10
Warrants Issued in the January 2022 Financing [Member]
Total outstanding and exercisable (in shares)	16,150,000
Underlying shares of common stock (in shares)	807,500
Exercise price per share (in dollars per share)	$ 9.60
Pre-funded Warrants Issued in August 2022 Financing [Member]
Total outstanding and exercisable (in shares)	1,766,864
Underlying shares of common stock (in shares)	1,766,864
Exercise price per share (in dollars per share)	$ 0.0001	$ 0.0001
Series A Private Investment Options Issued in August 2022 Financing [Member]
Total outstanding and exercisable (in shares)	2,853,883
Underlying shares of common stock (in shares)	2,853,883
Exercise price per share (in dollars per share)	$ 1.502
Series B Private Investment Options Issued in August 2022 Financing [Member]
Total outstanding and exercisable (in shares)	2,853,883
Underlying shares of common stock (in shares)	2,853,883
Exercise price per share (in dollars per share)	$ 1.502
Placement Agent Private Investment Options Issued in August 2022 Financing [Member]
Total outstanding and exercisable (in shares)	171,233
Underlying shares of common stock (in shares)	171,233
Exercise price per share (in dollars per share)	$ 2.19

Note 7 - Stockholders' Equity -

Note 7 - Stockholders' Equity - Restricted Stock Units Award Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Awards outstanding, shares (in shares)	10,060
Awards outstanding, Weighted Average Grant Date Fair Value (in dollars per share)	$ 24.39
Awards outstanding, Weighted Average Remaining Contractual Term (Year)	5 months 1 day	8 months 19 days
Awarded, shares (in shares)	0
Awarded, Weighted Average Grant Date Fair Value (in dollars per share)	$ 0
Released, shares (in shares)	(8,590)
Released, Weighted Average Grant Date Fair Value (in dollars per share)	$ 25.02
Forfeited, shares (in shares)	(1,053)
Forfeited, , Weighted Average Grant Date Fair Value (in dollars per share)	$ 24.25
Awards outstanding, shares (in shares)	417	10,060
Awards outstanding, Weighted Average Grant Date Fair Value (in dollars per share)	$ 11.64	$ 24.39

Note 8 - Stock-based Compensa_3

Note 8 - Stock-based Compensation - Noncash Stock-based Compensation Expense Related to Stock Options, ESPP, and RSUs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allocated Share-based Compensation Expense	$ 39	$ 239	$ 127	$ 960
Cost of Sales [Member]
Allocated Share-based Compensation Expense	4	24	18	93
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	11	78	37	274
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense	$ 24	$ 137	$ 72	$ 593

Note 9 - Subsequent Events (Det

Note 9 - Subsequent Events (Details Textual) - The 2015 Employee Stock Purchase Plan [Member] - Subsequent Event [Member]	Oct. 14, 2022 shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	1,750,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)	1,805,839