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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) | Total | Series F Preferred Stock | Preferred Stock Series F Preferred Stock | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | ---
Common stock, beginning balance (in shares) at Dec. 31, 2021 |  |  |  | 2,070,861 |  |  |
Treasury stock, beginning balance (in shares) at Dec. 31, 2021 |  |  |  |  | 7,553 |  |
Beginning balance at Dec. 31, 2021 | $ 25,497,000 |  |  | $ 0 | $ (181,000) | $ 227,584,000 | $ (201,906,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (4,539,000) |  |  |  |  |  | (4,539,000)
Stock-based compensation | 52,000 |  |  |  |  | 52,000 |
Forfeiture of unvested stock options | (84,000) |  |  |  |  | (84,000) |
Common stock, ending balance (in shares) at Mar. 31, 2022 |  |  |  | 2,070,861 |  |  |
Treasury stock, ending balance (in shares) at Mar. 31, 2022 |  |  |  |  | 7,553 |  |
Ending balance at Mar. 31, 2022 | 20,926,000 |  |  | $ 0 | $ (181,000) | 227,552,000 | (206,445,000)
Common stock, beginning balance (in shares) at Dec. 31, 2021 |  |  |  | 2,070,861 |  |  |
Treasury stock, beginning balance (in shares) at Dec. 31, 2021 |  |  |  |  | 7,553 |  |
Beginning balance at Dec. 31, 2021 | 25,497,000 |  |  | $ 0 | $ (181,000) | 227,584,000 | (201,906,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (20,724,000) |  |  |  |  |  |
Series F Preferred Stock dividends | 0 |  |  |  |  |  |
Treasury stock, ending balance (in shares) at Sep. 30, 2022 |  |  |  |  | 7,553 |  |
Ending balance at Sep. 30, 2022 | 4,803,000 |  |  | $ 0 | $ (181,000) | 227,614,000 | (222,630,000)
Common stock, beginning balance (in shares) at Mar. 31, 2022 |  |  |  | 2,070,861 |  |  |
Treasury stock, beginning balance (in shares) at Mar. 31, 2022 |  |  |  |  | 7,553 |  |
Beginning balance at Mar. 31, 2022 | 20,926,000 |  |  | $ 0 | $ (181,000) | 227,552,000 | (206,445,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (9,033,000) |  |  |  |  |  | (9,033,000)
Stock-based compensation | 31,000 |  |  |  |  | 31,000 |
Common stock, ending balance (in shares) at Jun. 30, 2022 |  |  |  | 2,070,861 |  |  |
Treasury stock, ending balance (in shares) at Jun. 30, 2022 |  |  |  |  | 7,553 |  |
Ending balance at Jun. 30, 2022 | 11,924,000 |  |  | $ 0 | $ (181,000) | 227,583,000 | (215,478,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (7,152,000) |  |  |  |  |  | (7,152,000)
Stock-based compensation | 31,000 |  |  |  |  | 31,000 |
Treasury stock, ending balance (in shares) at Sep. 30, 2022 |  |  |  |  | 7,553 |  |
Ending balance at Sep. 30, 2022 | $ 4,803,000 |  |  | $ 0 | $ (181,000) | 227,614,000 | (222,630,000)
Preferred stock, beginning balance (in shares) at Dec. 31, 2022 | 0 |  | 0 |  |  |  |
Common stock, beginning balance (in shares) at Dec. 31, 2022 | 2,070,861 |  |  | 2,070,861 |  |  |
Treasury stock, beginning balance (in shares) at Dec. 31, 2022 | 7,553 |  |  |  | 7,553 |  |
Beginning 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 | (1,219,000) |  |  |  |  |  | (1,219,000)
Stock-based compensation | 31,000 |  |  |  |  | 31,000 |
Proceeds from private placement, net of fees and amounts held in escrow (in shares) |  |  | 6,550 |  |  |  |
Proceeds from private placement, net of fees and amounts held in escrow | 1,473,000 |  |  |  |  | 1,473,000 |
Preferred stock, ending balance (in shares) at Mar. 31, 2023 |  |  | 6,550 |  |  |  |
Common stock, ending balance (in shares) at Mar. 31, 2023 |  |  |  | 2,070,861 |  |  |
Treasury stock, ending balance (in shares) at Mar. 31, 2023 |  |  |  |  | 7,553 |  |
Ending balance at Mar. 31, 2023 | $ 3,902,000 |  | $ 0 | $ 0 | $ (181,000) | 229,149,000 | (225,066,000)
Preferred stock, beginning balance (in shares) at Dec. 31, 2022 | 0 |  | 0 |  |  |  |
Common stock, beginning balance (in shares) at Dec. 31, 2022 | 2,070,861 |  |  | 2,070,861 |  |  |
Treasury stock, beginning balance (in shares) at Dec. 31, 2022 | 7,553 |  |  |  | 7,553 |  |
Beginning 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 | (3,163,000) |  |  |  |  |  |
Stock-based compensation (in shares) |  |  |  | 179,535 |  |  |
Common stock exchanged for pre-funded warrants (in shares) |  |  |  | (406,776) |  |  |
Conversions of Series F Preferred Stock (in shares) |  |  |  | 2,111,337 |  |  |
Series F Preferred Stock dividends | $ (282,000) |  |  |  |  |  |
Preferred stock, ending balance (in shares) at Sep. 30, 2023 | 5,146 | 5,146 | 5,146 |  |  |  |
Common stock, ending balance (in shares) at Sep. 30, 2023 | 4,294,455 |  |  | 4,294,455 |  |  |
Treasury stock, ending balance (in shares) at Sep. 30, 2023 | 7,553 |  |  | 7,553 | 7,553 |  |
Ending balance at Sep. 30, 2023 | $ 6,661,000 |  | $ 0 | $ 0 | $ (181,000) | 233,852,000 | (227,010,000)
Preferred stock, beginning balance (in shares) at Mar. 31, 2023 |  |  | 6,550 |  |  |  |
Common stock, beginning balance (in shares) at Mar. 31, 2023 |  |  |  | 2,070,861 |  |  |
Treasury stock, beginning balance (in shares) at Mar. 31, 2023 |  |  |  |  | 7,553 |  |
Beginning balance at Mar. 31, 2023 | 3,902,000 |  | $ 0 | $ 0 | $ (181,000) | 229,149,000 | (225,066,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (1,049,000) |  |  |  |  |  | (1,049,000)
Stock-based compensation (in shares) |  |  |  | 179,535 |  |  |
Stock-based compensation | 411,000 |  |  |  |  | 411,000 |
Warrant exercise, net of fees (in shares) |  |  |  | 339,498 |  |  |
Warrant exercise, net of fees | 534,000 |  |  |  |  | 534,000 |
Release of escrow from March 2023 private placement | 4,000,000 |  |  |  |  | 4,000,000 |
Fees associated with Series F Preferred Stock issuance | (38,000) |  |  |  |  | (38,000) |
Conversions of Series F Preferred Stock (in shares) |  |  | (175) | 146,587 |  |  |
Conversions of Series F Preferred Stock | 4,000 |  |  |  |  | 4,000 |
Series F Preferred Stock dividends | (149,000) | $ (148,744) |  |  |  | (149,000) |
Preferred stock, ending balance (in shares) at Jun. 30, 2023 |  | 6,375 | 6,375 |  |  |  |
Common stock, ending balance (in shares) at Jun. 30, 2023 |  |  |  | 2,736,481 |  |  |
Treasury stock, ending balance (in shares) at Jun. 30, 2023 |  |  |  |  | 7,553 |  |
Ending balance at Jun. 30, 2023 | 7,615,000 |  | $ 0 | $ 0 | $ (181,000) | 233,911,000 | (226,115,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (895,000) |  |  |  |  |  | (895,000)
Stock-based compensation | 31,000 |  |  |  |  | 31,000 |
Common stock exchanged for pre-funded warrants (in shares) |  |  |  | (406,776) |  |  |
Conversions of Series F Preferred Stock (in shares) |  |  | (1,229) | 1,964,750 |  |  |
Conversions of Series F Preferred Stock | 43,000 |  |  |  |  | 43,000 |
Series F Preferred Stock dividends | $ (133,000) | $ (133,364) |  |  |  | (133,000) |
Preferred stock, ending balance (in shares) at Sep. 30, 2023 | 5,146 | 5,146 | 5,146 |  |  |  |
Common stock, ending balance (in shares) at Sep. 30, 2023 | 4,294,455 |  |  | 4,294,455 |  |  |
Treasury stock, ending balance (in shares) at Sep. 30, 2023 | 7,553 |  |  | 7,553 | 7,553 |  |
Ending balance at Sep. 30, 2023 | $ 6,661,000 |  | $ 0 | $ 0 | $ (181,000) | $ 233,852,000 | $ (227,010,000)

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