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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Preferred Stock [Member] Series A Convertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Total | Series A Convertible Preferred Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2021 | $ 1 | $ 13 | $ 166,191 | $ (140,702) | $ 25,503 |
Balance (in shares) at Dec. 31, 2021 | 156 | 2,601 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock in connection with private offering | $ 0 | $ 1 | (1) | 0 | 0 |
Issuance of common stock in connection with private offering (in shares) | 0 | 275 |  |  |  |
Issuance of common stock from vested restricted stock units | $ 0 | $ 0 | (5) | 0 | (5) |
Issuance of common stock from vested restricted stock units (in shares) | 0 | 2 |  |  |  |
Issuance of common stock and warrants in connection with November 2022 private offering, net. | $ 0 | $ 12 | 7,383 | 0 | 7,395 |
Issuance of common stock and warrants in connection with November 2022 private offering, net. (in shares) | 0 | 2,185 |  |  |  |
Forfeiture of unvested restricted stock | $ 0 | $ 0 | 0 | 0 | 0 |
Forfeiture of unvested restricted stock (in shares) | 0 | (4) |  |  |  |
Cash dividends to Series A convertible preferred stockholders | $ 0 | $ 0 | 0 | (16) | (16) | $ (16)
Cash dividends to Series A convertible preferred stockholders (in shares) | 0 | 0 |  |  |  |
Stock-based compensation | $ 0 | $ 0 | 2,935 | 0 | 2,935 |
Net loss | 0 | 0 | 0 | (24,579) | (24,579) |
Balance at Dec. 31, 2022 | $ 1 | $ 26 | 177,377 | (165,297) | 12,107 |
Balance (in shares) at Dec. 31, 2022 | 156 | 5,127 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock in connection with Exacis asset acquisition | $ 0 | $ 0 | 208 | 0 | 208 |
Issuance of common stock in connection with Exacis asset acquisition (in shares) | 0 | 69 |  |  |  |
Issuance of common stock related to stock purchase agreement with Lincoln Park Capital Fund, LLC, net | $ 0 | $ 1 | 579 | 0 | 580 |
Issuance of common stock related to stock purchase agreement with Lincoln Park Capital Fund, LLC, net (in shares) | 0 | 214 |  |  |  |
Issuance of note warrants | $ 0 | $ 0 | 9,014 | 0 | 9,014 |
Repricing of warrants in connection with December 2023 financing | 0 | 0 | 766 | 0 | 766 |
Cash dividends to Series A convertible preferred stockholders | $ 0 | $ 0 | 0 | (16) | (16) | $ (16)
Cash dividends to Series A convertible preferred stockholders (in shares) | 0 | 0 |  |  |  |
Stock-based compensation | $ 0 | $ 0 | 1,242 | 0 | 1,242 |
Net loss | 0 | 0 | 0 | (21,668) | (21,668) |
Balance at Dec. 31, 2023 | $ 1 | $ 27 | $ 189,186 | $ (186,981) | $ 2,233 |
Balance (in shares) at Dec. 31, 2023 | 156 | 5,410 |  |  |  |

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