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CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Preferred Stock [Member] Series A 12% Convertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Deficit [Member] | Total
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2022 |  |  |  |  | $ 1,723
Beginning balance (in shares) at Dec. 31, 2022 |  |  |  |  | 176
Ending balance at Dec. 31, 2023 |  |  |  |  | $ 1,723
Ending balance (in shares) at Dec. 31, 2023 |  |  |  |  | 176
Beginning balance at Dec. 31, 2022 | $ 510 | $ 59 | $ 275,081 | $ (309,567) | $ (33,917)
Beginning balance (in shares) at Dec. 31, 2022 | 1,260,000 | 59,426,005 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Series A 12% convertible preferred stock dividend |  |  | 50 | (50) |
Series A 12% convertible preferred stock dividend (in shares) |  | 25,200 |  |  |
Series C super dividend redeemable convertible preferred stock dividend |  |  | 70 | (70) |
Series C super dividend redeemable convertible preferred stock dividend (in shares) |  | 35,200 |  |  |
Conversion of Series A Convertible Preferred to common | $ (10) |  | 10 |  |
Conversion of Series A Convertible Preferred to common (in shares) | (25,000) | 4,257 |  |  |
Issuance of common stock from exercise of warrants |  | $ 2 | 10,031 |  | $ 10,033
Issuance of common stock from exercise of warrants (in shares) |  | 2,236,204 |  |  |
Issuance of common stock from exercise of stock options, net of shares withheld for exercise (in shares) |  |  |  |  | 0
Issuance of common stock purchase warrants in connection with related party line of credit |  |  | 671 |  | $ 671
Warrant modification |  |  | 3,619 | (3,619) |
Stock-based compensation expense |  |  | 2,315 |  | 2,315
Stock-based compensation expense (in shares) |  | 126,048 |  |  |
Net loss |  |  |  | (41,066) | (41,066)
Ending balance at Dec. 31, 2023 | $ 500 | $ 61 | 291,847 | (354,372) | (61,964)
Ending balance (in shares) at Dec. 31, 2023 | 1,235,000 | 61,852,914 |  |  |
Ending balance at Dec. 31, 2024 |  |  |  |  | $ 1,723
Ending balance (in shares) at Dec. 31, 2024 |  |  |  |  | 176
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Series A 12% convertible preferred stock dividend |  |  | 64 | (64) |
Series A 12% convertible preferred stock dividend (in shares) |  | 24,700 |  |  |
Series C super dividend redeemable convertible preferred stock dividend |  |  | 89 | (89) |
Series C super dividend redeemable convertible preferred stock dividend (in shares) |  | 35,200 |  |  |
Issuance of common stock from exercise of warrants |  | $ 1 | 427 |  | $ 428
Issuance of common stock from exercise of warrants (in shares) |  | 142,370 |  |  |
Issuance of common stock from exercise of stock options, net of shares withheld for exercise |  |  | 799 |  | $ 799
Issuance of common stock from exercise of stock options, net of shares withheld for exercise (in shares) |  | 473,370 |  |  | 503,333
Issuance of common stock from restricted stock units (in shares) |  | 378,000 |  |  |
Issuance of common stock purchase warrants in connection with related party line of credit |  |  | 845 |  | $ 845
Stock-based compensation expense |  |  | 2,146 |  | 2,146
Stock-based compensation expense (in shares) |  | 250,548 |  |  |
Net loss |  |  |  | (47,047) | (47,047)
Ending balance at Dec. 31, 2024 | $ 500 | $ 62 | $ 296,217 | $ (401,572) | $ (104,793)
Ending balance (in shares) at Dec. 31, 2024 | 1,235,000 | 63,157,235 |  |  |

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