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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) | Total | Series F Preferred Stock | Preferred Stock Series F Preferred Stock | Common Stock | Common Stock Pre-Funded Warrants | Treasury Stock | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | ---
Preferred stock, beginning balance (in shares) at Dec. 31, 2021 |  |  | 0 |  |  |  |  |
Common stock, beginning balance (in shares) at Dec. 31, 2021 |  |  |  | 2,071,000 |  |  |  |
Treasury stock, beginning balance (in shares) at Dec. 31, 2021 |  |  |  |  |  | 8,000 |  |
Beginning balance at Dec. 31, 2021 | $ 25,497,000 |  | $ 0 | $ 0 |  | $ (181,000) | $ 227,584,000 | $ (201,906,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss | (21,941,000) |  |  |  |  |  |  | (21,941,000)
Stock-based compensation | 146,000 |  |  |  |  |  | 146,000 |
Forfeiture of unvested stock options | (85,000) |  |  |  |  |  | (85,000) |
Series F Preferred Stock dividends | $ 0 |  |  |  |  |  |  |
Preferred stock, ending balance (in shares) at Dec. 31, 2022 | 1,930 | 0 | 0 |  |  |  |  |
Common stock, ending balance (in shares) at Dec. 31, 2022 | 2,071,000 |  |  | 2,071,000 |  |  |  |
Treasury stock, ending balance (in shares) at Dec. 31, 2022 | 8,000 |  |  |  |  | 8,000 |  |
Ending balance at Dec. 31, 2022 | $ 3,617,000 |  | $ 0 | $ 0 |  | $ (181,000) | 227,645,000 | (223,847,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss | (4,384,000) |  |  |  |  |  |  | (4,384,000)
Stock-based compensation | 504,000 |  |  | $ 180,000 |  |  | 504,000 |
Proceeds from private placement, net of fees (in shares) |  |  | 6,550 |  |  |  |  |
Proceeds from private placement, net of fees | 5,364,000 |  |  |  |  |  | 5,364,000 |
Proceeds from warrant exercise, net of fees (in shares) |  |  |  | 339,000 |  |  |  |
Proceeds from warrant exercise, net of fees | 534,000 |  |  |  |  |  | 534,000 |
Common stock exchanged for pre-funded warrants |  |  |  | (406,776) | (407,000) |  |  |
Exercise of pre-funded warrants (in shares) |  |  |  | 746,027 | 407,000 |  |  |
Conversions of Series F Preferred Stock (in shares) |  |  | (4,620) | 14,102,477 |  |  |  |
Conversions of Series F Preferred Stock and accrued dividends | 209,000 |  |  | $ 2,000 |  |  | 207,000 |
Series F Preferred Stock dividends | $ (343,000) | $ (343,000) |  |  |  |  | (343,000) |
Preferred stock, ending balance (in shares) at Dec. 31, 2023 | 1,930 | 1,930 | 1,930 |  |  |  |  |
Common stock, ending balance (in shares) at Dec. 31, 2023 | 16,692,124 |  |  | 16,692,000 |  |  |  |
Treasury stock, ending balance (in shares) at Dec. 31, 2023 | 8,000 |  |  | 7,553 |  | 8,000 |  |
Ending balance at Dec. 31, 2023 | $ 5,501,000 |  | $ 0 | $ 2,000 |  | $ (181,000) | $ 233,911,000 | $ (228,231,000)

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