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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock | Common Stock | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid-in Capital | Additional Paid-in Capital Preferred Stock | Accumulated Other Comprehensive Loss | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment | Preferred Stock | Preferred Stock Preferred Stock | Preferred Stock Common Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  | 2,418,000 |  |  |  |  |  | 0 |  |
Beginning balance at Dec. 31, 2018 | $ 11,052 |  |  | $ (186) | $ 0 | $ 128,368 |  | $ (1) | $ (117,315) | $ (186) | $ 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans (in shares) |  |  |  |  | 78,000 |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans | 5 |  |  |  |  | 5 |  |  |  |  |  |  |
Common stock withheld in lieu of income tax withholding from share-based compensation (in shares) |  |  |  |  | (10,000) |  |  |  |  |  |  |  |
Common stock withheld in lieu of income tax withholding from share-based compensation | (116) |  |  |  |  | (116) |  |  |  |  |  |  |
Stock-based compensation | 616 |  |  |  |  | 616 |  |  |  |  |  |  |
Foreign currency translation adjustment | (2) |  |  |  |  |  |  | (2) |  |  |  |  |
Net loss | (7,373) |  |  |  |  |  |  |  | (7,373) |  |  |  |
Ending balance at Dec. 31, 2019 | 3,996 |  |  |  | $ 0 | 128,873 |  | (3) | (124,874) |  | $ 0 |  |
Ending balance (in shares) at Dec. 31, 2019 |  |  |  |  | 2,486,000 |  |  |  |  |  | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans (in shares) |  |  |  |  | 60,000 |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans | 100 |  |  |  |  | 100 |  |  |  |  |  |  |
Common stock withheld in lieu of income tax withholding from share-based compensation | (3) |  |  |  |  | (3) |  |  |  |  |  |  |
Stock-based compensation | 131 |  |  |  |  | 131 |  |  |  |  |  |  |
Foreign currency translation adjustment | 0 |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (5,981) |  |  |  |  |  |  |  | (5,981) |  |  |  |
Issuance of common stock and warrants (in shares) |  |  |  |  | 688,000 |  |  |  |  |  |  |  |
Issuance of common stock and warrants | 2,749 |  |  |  |  | 2,749 |  |  |  |  |  |  |
Offering costs on issuance of common stock and warrants | (510) |  |  |  |  | (510) |  |  |  |  |  |  |
Issuance of common stock upon the exercise of warrants |  |  |  |  | 269,000 |  |  |  |  |  |  |  |
Issuance of common stock upon the exercise of warrants | 2,235 |  |  |  |  | 2,235 |  |  |  |  |  |  |
Warrant liability - issuance | (1,636) |  |  |  |  | (1,636) |  |  |  |  |  |  |
Warrant liability - modification | 1,405 |  |  |  |  | 1,405 |  |  |  |  |  |  |
Conversion of convertible securities |  |  | 22,000 |  | 22,310 |  |  |  |  |  | 111,548 | 2,709,000 | 112,000
Conversion of notes to preferred stock |  | $ 1,769 |  |  |  |  | $ 1,769 |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 4,255 |  |  |  | $ 0 | $ 135,113 |  | $ (3) | $ (130,855) |  | $ 0 |  |
Ending balance (in shares) at Dec. 31, 2020 |  |  |  |  | 3,525,000 |  |  |  |  |  | 2,597,000 |  |

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