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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Series D and E Preferred Stock | Preferred Stock Series A-2 Preferred Stock | Preferred Stock Series C 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 and E Preferred Stock | Treasury Stock | Additional Paid-In Capital | Additional Paid-In Capital Series D and E Preferred Stock | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2019 |  |  | 32 | 475 | 1,734,901 | 131,579 | 5,266,828 |  |  | 105,285 |  |  |
Beginning Balance at Dec. 31, 2019 | $ 21,785 |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 1 |  |  | $ (165) | $ 207,383 |  | $ (185,434)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (3,129) |  |  |  |  |  |  |  |  |  |  |  | (3,129)
Stock-based compensation | 32 |  |  |  |  |  |  |  |  |  | 32 |  |
Preferred stock conversion (in shares) |  |  |  | (150) |  |  | 50,000 |  |  |  |  |  |
Issuance of preferred stock for accrued dividends (in shares) |  |  | 13 |  |  |  |  |  |  |  |  |  |
Issuance of preferred stock for accrued dividends | 98 |  |  |  |  |  |  |  |  |  | 98 |  |
Forfeited restricted stock (in shares) |  |  |  |  | 14,441 |  |  |  |  |  |  |  |
Preferred stock dividends | (4) |  |  |  |  |  |  |  |  |  | (4) |  |
Purchase of treasury stock | (7) |  |  |  |  |  |  |  |  | $ (7) |  |  |
Ending Balance (in shares) at Mar. 31, 2020 |  |  | 45 | 325 | 1,720,460 | 131,579 | 5,316,828 |  |  | 105,285 |  |  |
Ending Balance at Mar. 31, 2020 | 18,775 |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 1 |  |  | $ (172) | 207,509 |  | (188,563)
Beginning Balance (in shares) at Dec. 31, 2019 |  |  | 32 | 475 | 1,734,901 | 131,579 | 5,266,828 |  |  | 105,285 |  |  |
Beginning Balance at Dec. 31, 2019 | $ 21,785 |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 1 |  |  | $ (165) | 207,383 |  | (185,434)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  | $ (16) |  |  |
Forfeited restricted stock (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Series D Preferred Stock exchanged for taxes (in shares) |  |  |  |  |  |  |  |  |  | (8,000) |  |  |
Ending Balance (in shares) at Dec. 31, 2020 |  |  | 45 |  | 1,697,958 | 131,579 | 7,861,912 |  |  | 113,283 |  |  |
Ending Balance at Dec. 31, 2020 | $ 22,057 |  | $ 0 |  | $ 0 | $ 0 | $ 1 |  |  | $ (181) | 215,092 |  | (192,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (3,433) |  |  |  |  |  |  |  |  |  |  |  | (3,433)
Stock-based compensation | 33 |  |  |  |  |  |  |  |  |  | 33 |  |
Preferred stock conversion (in shares) |  |  | (45) |  | (1,697,022) | (131,579) | 18,846,411 | 84,292 | 18,762,119 |  |  |  |
Preferred stock conversion |  | $ 0 |  |  |  |  |  |  | $ 2 |  |  | $ (2) |
Issuance of stock for services (in shares) |  |  |  |  |  |  | 21,008 |  |  |  |  |  |
Issuance of stock for services | 274 |  |  |  |  |  |  |  |  |  | 274 |  |
Forfeited restricted stock (in shares) |  |  |  |  | (81) |  |  |  |  |  |  |  |
Series D Preferred Stock exchanged for taxes (in shares) |  |  |  |  | (855) |  |  |  |  |  |  |  |
Ending Balance (in shares) at Mar. 31, 2021 |  |  | 0 |  | 0 | 0 | 26,729,331 |  |  | 113,283 |  |  |
Ending Balance at Mar. 31, 2021 | $ 18,931 |  | $ 0 |  | $ 0 | $ 0 | $ 3 |  |  | $ (181) | $ 215,397 |  | $ (196,288)

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