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Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2020 0 41,782      
Balance at Dec. 31, 2020 $ 0 $ 418 $ 147,963 $ (136,063) $ 12,318
Balance at Dec. 31, 2020 0 (418) (147,963) 136,063 (12,318)
Net Loss $ 0 $ 0 0 (1,518) (1,518)
Conversion of Series B Non-Voting Preferred Stock to common stock         0
Stock-based compensation expense related to employee and director stock options     130   130
Balance (in shares) at Mar. 31, 2021 0 41,782      
Balance at Mar. 31, 2021 $ 0 $ 418 148,146 (137,581) 10,983
Balance at Mar. 31, 2021 $ 0 $ (418) (148,146) 137,581 (10,983)
Stock-based compensation expense related to non-employee stock options     53   53
Balance (in shares) at Dec. 31, 2021 14 47,766      
Balance at Dec. 31, 2021 $ 680 $ 478 150,900 141,887 10,171
Balance at Dec. 31, 2021 (680) (478) (150,900) (141,887) (10,171)
Net Loss 0 0 0 (111) (111)
Reclassification of Private Placement Warrants $ 0 $ 0 7,502 0 7,502
Conversion of Series B Non-Voting Preferred Stock to common stock (in shares) (1) (3,653)      
Conversion of Series B Non-Voting Preferred Stock to common stock $ (71)       (71)
Conversion of Series B Non-Voting Preferred Stock to common stock (in shares) 1 3,653      
Conversion of Series B Non-Voting Preferred Stock to common stock   $ 36 35    
Stock-based compensation expense related to employee and director stock options     184   184
Balance (in shares) at Mar. 31, 2022 13 51,419      
Balance at Mar. 31, 2022 $ 609 $ 514 158,621 141,998 17,746
Balance at Mar. 31, 2022 $ (609) $ (514) $ (158,621) $ (141,998) $ (17,746)