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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjusted Balance | Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjusted Balance
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2021 |  |  |  | 876,000 |  |  |  |  |  |
Beginning balance at Dec. 31, 2021 |  | $ 6,209 |  | $ 0 | $ 0 |  | $ 144,953 | $ (3) | $ (138,741) |
Beginning balance (in shares) at Dec. 31, 2021 | [1] |  |  |  | 910,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans (in shares) | [1] |  |  |  | 7,000 |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans |  | 6 |  |  |  |  | 6 |  |  |
Stock issued in exchange transactions (in shares) | [1] |  |  |  | 94,000 |  |  |  |  |
Stock issued in exchange transactions |  | 304 |  |  |  |  | 304 |  |  |
Issuance of common stock and warrants (in shares) | [1] |  |  |  | 187,000 |  |  |  |  |
Issuance of common stock and warrants |  | 3,500 |  |  | $ 1 |  | 3,499 |  |  |
Offering costs on issuance of common stock and warrants |  | $ (334) |  |  |  |  | (334) |  |  |
Issuance of common stock upon the exercise of warrants (in shares) |  | 0 |  |  | 209,000 | [1] |  |  |  |
Stock-based compensation |  | $ 117 |  |  |  |  | 117 |  |  |
Net loss |  | (10,279) |  |  |  |  |  |  | (10,279) |
Ending balance (in shares) at Dec. 31, 2022 |  |  |  | 876,000 |  |  |  |  |  |
Ending balance at Dec. 31, 2022 |  | $ (477) |  | $ 0 | $ 1 |  | 148,545 | (3) | (149,020) |
Ending balance (in shares) at Dec. 31, 2022 |  | 1,406,920 |  |  | 1,407,000 | [1] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans (in shares) | [1] |  |  |  | 2,477,000 |  |  |  |  |
Issuance of common stock under employee stock option and stock purchase plans |  | $ 6,079 |  |  | $ 1 |  | 6,078 |  |  |
Stock issued in exchange transactions (in shares) | [1] |  |  |  | 465,000 |  |  |  |  |
Stock issued in exchange transactions |  | 1,716 |  |  |  |  | 1,716 |  |  |
Par value adjustment due to reverse stock split |  | 0 |  |  | $ (2) |  | 2 |  |  |
Reduction in equity due to costs from reverse stock split |  | $ (16) |  |  |  |  | (16) |  |  |
Issuance of common stock upon the exercise of warrants (in shares) |  | 0 |  |  |  |  |  |  |  |
Stock-based compensation |  | $ 44 |  |  |  |  | 44 |  |  |
Net loss |  | (4,293) |  |  |  |  |  |  | (4,293) |
Ending balance (in shares) at Dec. 31, 2023 |  |  |  | 876,000 |  |  |  |  |  |
Ending balance at Dec. 31, 2023 |  | $ 3,051 | $ (2) | $ 0 | $ 0 |  | $ 156,369 | $ (3) | $ (153,315) | $ (2)
Ending balance (in shares) at Dec. 31, 2023 |  | 4,348,690 |  |  | 4,349,000 | [1] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] |  | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
[1] | Shares outstanding for prior periods have been restated for the 1-for-7 reverse stock split effective June 16, 2023.

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