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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Series A-2 Preferred Stock | Series D Preferred Stock | Series E Preferred Stock | Preferred Stock Series A-2 Preferred Stock | Preferred Stock Series D Preferred Stock | Preferred Stock Series E Preferred Stock | Common Stock | Common Stock Series A-2 Preferred Stock | Common Stock Series D & E Preferred Stock conversion | Treasury Stock | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Preferred stock, beginning balance (in shares) at Dec. 31, 2020 |  |  |  |  | 45 | 1,697,958 | 131,579 |  |  |  |  |  |
Common stock, beginning balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  | 533,000 |  |  |  |  |
Treasury stock, beginning balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  |  |  |  | 8,000 |  |
Beginning Balance at Dec. 31, 2020 | $ 22,057 |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  | $ (181) | $ 215,093 | $ (192,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (9,051) |  |  |  |  |  |  |  |  |  |  |  | (9,051)
Stock-based compensation | 713 |  |  |  |  |  |  |  |  |  |  | 713 |
Series D & E Preferred Stock conversion and Series A2 Preferred Stock conversion (in shares) |  |  |  |  | (45) | (1,697,022) | (131,579) | 1,257,000 | 6,000 | 1,251,000 |  |  |
Forfeiture of series D stock (in shares) |  |  |  |  |  | (81) |  |  |  |  |  |  |
Series D shares exchanged for tax (in shares) |  |  |  |  |  | (855) |  |  |  |  |  |  |
Issuance of stock for services (in shares) |  |  |  |  |  |  |  | 1,000 |  |  |  |  |
Issuance of stock for services | 274 |  |  |  |  |  |  |  |  |  |  | 274 |
Issuance of shares from financing, net of issuance costs (in shares) |  |  |  |  |  |  |  | 267,000 |  |  |  |  |
Issuance of shares from financing, net of issuance costs | $ 11,504 |  |  |  |  |  |  |  |  |  |  | 11,504 |
Issuance of stock on vested restricted stock units (in shares) |  |  |  |  |  |  |  | 13,000 |  |  |  |  |
Preferred stock, ending balance (in shares) at Dec. 31, 2021 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  |
Common stock, ending balance (in shares) at Dec. 31, 2021 | 2,062,030 |  |  |  |  |  |  | 2,071,000 |  |  |  |  |
Treasury stock, ending balance (in shares) at Dec. 31, 2021 | 7,553 |  |  |  |  |  |  |  |  |  | 8,000 |  |
Ending Balance at Dec. 31, 2021 | $ 25,497 |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  | $ (181) | 227,584 | (201,906)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (21,941) |  |  |  |  |  |  |  |  |  |  |  | (21,941)
Stock-based compensation | 146 |  |  |  |  |  |  |  |  |  |  | 146 |
Forfeiture of unvested stock options | $ (85) |  |  |  |  |  |  |  |  |  |  | (85) |
Preferred stock, ending balance (in shares) at Dec. 31, 2022 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  |
Common stock, ending balance (in shares) at Dec. 31, 2022 | 2,070,861 |  |  |  |  |  |  | 2,071,000 |  |  |  |  |
Treasury stock, ending balance (in shares) at Dec. 31, 2022 | 7,553 |  |  |  |  |  |  |  |  |  | 8,000 |  |
Ending Balance at Dec. 31, 2022 | $ 3,617 |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  | $ (181) | $ 227,645 | $ (223,847)

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