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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Preferred Stock [Member]
Series A Preferred Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Total
Balance at Dec. 31, 2021 $ 13 $ 1 $ 166,191 $ (140,702) $ 25,503
Balance (in shares) at Dec. 31, 2021 2,601 156      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock and pre-funded warrants in connection with private offering, net. $ 1 $ 0 (1) 0 0
Issuance of common stock and pre-funded warrants in connection with private offering, net. (in shares) 275 0      
Forfeiture of unvested restricted stock $ 0 $ 0 0 0 0
Forfeiture of unvested restricted stock (in shares) (4) 0      
Issuance of common stock from vested restricted stock units $ 0 $ 0 0 0 0
Issuance of common stock from vested restricted stock units (in shares) 0 0      
Stock-based compensation $ 0 $ 0 1,183 0 1,183
Net loss 0 0 0 (9,375) (9,375)
Balance at Mar. 31, 2022 $ 14 $ 1 167,373 (150,077) 17,311
Balance (in shares) at Mar. 31, 2022 2,872 156      
Balance at Dec. 31, 2022 $ 26 $ 1 177,377 (165,297) 12,107
Balance (in shares) at Dec. 31, 2022 5,127 156      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation $ 0 $ 0 689 0 689
Net loss 0 0 0 (5,416) (5,416)
Balance at Mar. 31, 2023 $ 26 $ 1 $ 178,066 $ (170,713) $ 7,380
Balance (in shares) at Mar. 31, 2023 5,127 156