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Consolidated Statements Convertible Preferred Stock and Stockholders' Equity - USD ($) $ in Thousands | Total | Warrant Inducement Agreements [Member] | September 2023 Offering [Member] | April 2023 Offering [Member] | May 2024 Offering [Member] | December 2024 Offering [Member] | January 2023 Offering [Member] | Preferred Stock [Member] | Common Stock [Member] | Common Stock [Member] Warrant Inducement Agreements [Member] | Common Stock [Member] September 2023 Offering [Member] | Common Stock [Member] April 2023 Offering [Member] | Common Stock [Member] May 2024 Offering [Member] | Common Stock [Member] December 2024 Offering [Member] | Common Stock [Member] January 2023 Offering [Member] | Additional Paid-in Capital [Member] | [1] | Additional Paid-in Capital [Member] Warrant Inducement Agreements [Member] | [1] | Additional Paid-in Capital [Member] September 2023 Offering [Member] | [1] | Additional Paid-in Capital [Member] April 2023 Offering [Member] | [1] | Additional Paid-in Capital [Member] May 2024 Offering [Member] | [1] | Additional Paid-in Capital [Member] December 2024 Offering [Member] | [1] | Additional Paid-in Capital [Member] January 2023 Offering [Member] | [1] | Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  |  | 200,000 | 196,287 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2022 |  | $ 12,479 |  |  |  |  |  |  | $ 2 | $ 2 | [1] |  |  |  |  |  |  |  |  |  |  |  | $ 121,665 |  |  |  |  |  |  | $ (109,190)
Net loss |  | (12,300) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,300)
Issuance of common stock for employee stock purchase plan (shares) | [1] |  |  |  |  |  |  |  |  | 2,245 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for employee stock purchase plan |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |
Stock-based compensation expense and related charges |  | 624 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 624 |  |  |  |  |  |  |
Issuance of common stock upon warrant exercises (in shares) | [1] |  |  |  |  |  |  |  |  | 146,932 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon warrant exercises |  | 1,350 |  |  |  |  |  |  |  | $ 1 | [1] |  |  |  |  |  |  |  |  |  |  |  | 1,349 |  |  |  |  |  |  |
Issuance of common stock for vesting of restricted stock units, net of employee withholding tax liability (in shares) | [1] |  |  |  |  |  |  |  |  | 4,074 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock warrants related to promissory note (in shares) | [1] |  |  |  |  |  |  |  |  |  |  |  |  | 155,959 |  | 80,770 |  |  |  |  |  | 31,789 |  |  |  |  |  |  |  |
Issuance of common stock warrants related to promissory note |  |  |  | $ 1,676 | $ 5,301 |  |  | $ 2,166 |  |  |  |  |  | $ 2 | [1] | $ 1 | [1] |  |  |  |  |  |  |  | $ 1,674 | $ 5,300 |  |  | $ 2,166 |
Adjustment to record the impact of exercise price reset on outstanding warrants related to down round provisions |  | (16) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |  |  | (16)
Balance (in shares) at Dec. 31, 2023 |  |  |  |  |  |  |  |  | 200,000 | 618,056 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2023 |  | 11,313 |  |  |  |  |  |  | $ 2 | $ 6 | [1] |  |  |  |  |  |  |  |  |  |  |  | 132,811 |  |  |  |  |  |  | (121,506)
Net loss |  | (14,438) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,438)
Issuance of common stock for employee stock purchase plan (shares) | [1] |  |  |  |  |  |  |  |  | 2,256 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for employee stock purchase plan |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |
Issuance of common stock to vendor (in shares) | [1] |  |  |  |  |  |  |  |  | 32,632 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock to vendor |  | 135 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135 |  |  |  |  |  |  |
Stock-based compensation expense and related charges |  | 652 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 652 |  |  |  |  |  |  |
Issuance of common stock upon warrant exercises (in shares) | [1] |  |  |  |  |  |  |  |  | 1,626,496 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon warrant exercises |  | 3 |  |  |  |  |  |  |  | $ 16 | [1] |  |  |  |  |  |  |  |  |  |  |  | (13) |  |  |  |  |  |  |
Issuance of common stock for vesting of restricted stock units, net of employee withholding tax liability (in shares) | [1] |  |  |  |  |  |  |  |  | 18,046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for vesting of restricted stock units, net of employee withholding tax liability |  | (25) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (25) |  |  |  |  |  |  |
Issuance of common stock warrants related to promissory note (in shares) | [1] |  |  |  |  |  |  |  |  |  |  | 228,162 |  |  |  |  |  | 85,100 |  | 158,000 |  |  |  |  |  |  |  |  |  |
Issuance of common stock warrants related to promissory note |  |  | $ 2,160 |  |  | $ 3,544 | $ 4,137 |  |  |  |  | $ 2 | [1] |  |  |  |  | $ 1 | [1] | $ 2 | [1] |  |  | $ 2,158 |  |  | $ 3,543 | $ 4,135 |  |
Reverse stock split fractional share settlement | [1] |  |  |  |  |  |  |  |  | (102) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to record the impact of exercise price reset on outstanding warrants related to down round provisions |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2024 |  |  |  |  |  |  |  |  | 200,000 | 2,768,646 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2024 |  | $ 7,492 |  |  |  |  |  |  | $ 2 | $ 27 | [1] |  |  |  |  |  |  |  |  |  |  |  | $ 143,407 |  |  |  |  |  |  | $ (135,944)
[1] | (*) Adjusted to reflect the 1-for-15 reverse stock split effected on April 5, 2024.

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