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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock | Preferred Stock | Preferred Stock Preferred Stock | Common Stock | Additional Paid-in Capital | Additional Paid-in Capital Preferred Stock | Accumulated Other Comprehensive Loss | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at the beginning of the period (in shares) at Dec. 31, 2019 |  |  |  | 0 |  | 2,486,000 | [1] |  |  |  |
Balance at the beginning of the period at Dec. 31, 2019 |  | $ 3,996 |  | $ 0 |  | $ 0 |  | $ 128,873 |  | $ (3) | $ (124,874)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans (in shares) | [1] |  |  |  |  | 5,000 |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans |  | 0 |  |  |  |  |  |  |  |  |
Offering costs on issuance of common stock and warrants |  | (474) |  |  |  |  |  | (474) |  |  |
Warrant liability |  | (1,636) |  |  |  |  |  | (1,636) |  |  |
Issuance of common stock and warrants (in shares) | [1] |  |  |  |  | 688,000 |  |  |  |  |
Issuance of common stock and warrants |  | 2,749 |  |  |  |  |  | 2,749 |  |  |
Conversion of notes to preferred stock (in shares) |  |  |  |  | 2,709,000 |  |  |  |  |  |
Conversion of notes to preferred stock |  |  | $ 1,769 |  |  |  |  |  | $ 1,769 |  |
Stock-based compensation |  | 20 |  |  |  |  |  | 20 |  |  |
Net loss |  | (541) |  |  |  |  |  |  |  |  | (541)
Balance at the end of the period (in shares) at Mar. 31, 2020 |  |  |  | 2,709,000 |  | 3,179,000 | [1] |  |  |  |
Balance at the end of the period at Mar. 31, 2020 |  | 5,883 |  | $ 0 |  | $ 0 |  | 131,301 |  | (3) | (125,415)
Balance at the beginning of the period (in shares) at Dec. 31, 2019 |  |  |  | 0 |  | 2,486,000 | [1] |  |  |  |
Balance at the beginning of the period at Dec. 31, 2019 |  | 3,996 |  | $ 0 |  | $ 0 |  | 128,873 |  | (3) | (124,874)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net loss |  | (6,046) |  |  |  |  |  |  |  |  |
Balance at the end of the period (in shares) at Sep. 30, 2020 |  |  |  | 2,597,000 |  | 3,428,000 | [1],[2] |  |  |  |
Balance at the end of the period at Sep. 30, 2020 |  | 2,139 |  | $ 0 |  | $ 0 |  | 133,062 |  | (3) | (130,920)
Balance at the beginning of the period (in shares) at Mar. 31, 2020 |  |  |  | 2,709,000 |  | 3,179,000 | [1] |  |  |  |
Balance at the beginning of the period at Mar. 31, 2020 |  | 5,883 |  | $ 0 |  | $ 0 |  | 131,301 |  | (3) | (125,415)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans (in shares) | [1] |  |  |  |  | 0 |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans |  | 30 |  |  |  |  |  | 30 |  |  |
Issuance of common stock upon the exercise of warrants (in shares) | [1] |  |  |  |  | 15,000 |  |  |  |  |
Issuance of common stock upon the exercise of warrants |  | 103 |  |  |  |  |  | 103 |  |  |
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units |  | (3) |  |  |  |  |  | (3) |  |  |
Conversion of notes to preferred stock (in shares) |  |  |  | 112,000 |  | 22,000 | [1] |  |  |  |
Stock-based compensation |  | 41 |  |  |  |  |  | 41 |  |  |
Net loss |  | (4,340) |  |  |  |  |  |  |  |  | (4,340)
Balance at the end of the period (in shares) at Jun. 30, 2020 |  |  |  | 2,597,000 |  | 3,216,000 | [1] |  |  |  |
Balance at the end of the period at Jun. 30, 2020 |  | 1,714 |  | $ 0 |  | $ 0 |  | 131,472 |  | (3) | (129,755)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans (in shares) | [1] |  |  |  |  | 30,000 |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans |  | 0 |  |  |  |  |  | 0 |  |  |
Issuance of common stock upon the exercise of warrants (in shares) | [1] |  |  |  |  | 182,000 |  |  |  |  |
Issuance of common stock upon the exercise of warrants |  | 1,555 |  |  |  |  |  | 1,555 |  |  |
Stock-based compensation |  | 35 |  |  |  |  |  | 35 |  |  |
Net loss |  | (1,165) |  |  |  |  |  |  |  |  | (1,165)
Balance at the end of the period (in shares) at Sep. 30, 2020 |  |  |  | 2,597,000 |  | 3,428,000 | [1],[2] |  |  |  |
Balance at the end of the period at Sep. 30, 2020 |  | 2,139 |  | $ 0 |  | $ 0 |  | 133,062 |  | (3) | (130,920)
Balance at the beginning of the period (in shares) at Dec. 31, 2020 |  |  |  | 2,597,000 |  | 3,525,000 |  |  |  |  |
Balance at the beginning of the period at Dec. 31, 2020 |  | 4,255 |  | $ 0 |  | $ 0 |  | 135,113 |  | (3) | (130,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans (in shares) |  |  |  |  |  | 1,000 |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans |  | 0 |  |  |  |  |  |  |  |  |
Issuance of common stock upon the exercise of warrants (in shares) |  |  |  |  |  | 156,000 |  |  |  |  |
Issuance of common stock upon the exercise of warrants |  | 527 |  |  |  |  |  | 527 |  |  |
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (in shares) |  |  |  |  |  | 0 |  |  |  |  |
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units |  | (2) |  |  |  |  |  | (2) |  |  |
Stock-based compensation |  | 140 |  |  |  |  |  | 140 |  |  |
Net loss |  | (1,642) |  |  |  |  |  |  |  |  | (1,642)
Balance at the end of the period (in shares) at Mar. 31, 2021 |  |  |  | 2,597,000 |  | 3,682,000 |  |  |  |  |
Balance at the end of the period at Mar. 31, 2021 |  | 3,278 |  | $ 0 |  | $ 0 |  | 135,778 |  | (3) | (132,497)
Balance at the beginning of the period (in shares) at Dec. 31, 2020 |  |  |  | 2,597,000 |  | 3,525,000 |  |  |  |  |
Balance at the beginning of the period at Dec. 31, 2020 |  | $ 4,255 |  | $ 0 |  | $ 0 |  | 135,113 |  | (3) | (130,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon the exercise of warrants (in shares) |  | 156,446 |  |  |  |  |  |  |  |  |
Net loss |  | $ (5,255) |  |  |  |  |  |  |  |  |
Balance at the end of the period (in shares) at Sep. 30, 2021 |  |  |  | 876,000 |  | 5,087,000 |  |  |  |  |
Balance at the end of the period at Sep. 30, 2021 |  | 4,502 |  | $ 0 |  | $ 0 |  | 140,615 |  | (3) | (136,110)
Balance at the beginning of the period (in shares) at Mar. 31, 2021 |  |  |  | 2,597,000 |  | 3,682,000 |  |  |  |  |
Balance at the beginning of the period at Mar. 31, 2021 |  | 3,278 |  | $ 0 |  | $ 0 |  | 135,778 |  | (3) | (132,497)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans (in shares) |  |  |  |  |  | 69,000 |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans |  | 59 |  |  |  |  |  | 59 |  |  |
Offering costs on issuance of common stock and warrants |  | (469) |  |  |  |  |  | (469) |  |  |
Issuance of common stock and warrants (in shares) |  |  |  |  |  | 990,000 |  |  |  |  |
Issuance of common stock and warrants |  | 5,000 |  |  |  |  |  | 5,000 |  |  |
Conversion of notes to preferred stock (in shares) |  |  |  | 1,721,000 |  | 344,000 |  |  |  |  |
Stock-based compensation |  | 208 |  |  |  |  |  | 208 |  |  |
Net loss |  | (2,473) |  |  |  |  |  |  |  |  | (2,473)
Balance at the end of the period (in shares) at Jun. 30, 2021 |  |  |  | 876,000 |  | 5,085,000 |  |  |  |  |
Balance at the end of the period at Jun. 30, 2021 |  | 5,603 |  | $ 0 |  | $ 0 |  | 140,576 |  | (3) | (134,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans (in shares) |  |  |  |  |  | 2,000 |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans |  | 0 |  |  |  |  |  |  |  |  |
Offering costs on issuance of common stock and warrants |  | (1) |  |  |  |  |  | (1) |  |  |
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units |  | 1 |  |  |  |  |  | 1 |  |  |
Stock-based compensation |  | 39 |  |  |  |  |  | 39 |  |  |
Net loss |  | (1,140) |  |  |  |  |  |  |  |  | (1,140)
Balance at the end of the period (in shares) at Sep. 30, 2021 |  |  |  | 876,000 |  | 5,087,000 |  |  |  |  |
Balance at the end of the period at Sep. 30, 2021 |  | $ 4,502 |  | $ 0 |  | $ 0 |  | $ 140,615 |  | $ (3) | $ (136,110)
[1] | Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split effective June 11, 2020.
[2] | * Shares outstanding for the nine months ended September 30, 2020 have been restated for the 1-for-5 reverse stock split effective June 11, 2020.

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