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Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance (in shares) at Dec. 31, 2021 1,275 33,461        
Balance at Dec. 31, 2021 $ 1 $ 33 $ 205,305 $ (321,227) $ (4,350) $ (120,238)
Issuance of common stock (in shares) 0 341        
Issuance of common stock $ 0 $ 1 3,348 0 0 3,349
Stock options exercised (in shares) 0 263        
Stock options exercised $ 0 $ 0 196 0 0 196
Stock-based compensation $ 0 $ 0 2,040 0 0 2,040
Issuance and exercise of warrants (in shares) 0 113        
Issuance and exercise of warrants $ 0 $ 0 4,550 0 0 4,550
Foreign currency translation gain 0 0 0 0 (194) (194)
Net loss $ 0 0 0 (18,294) 0 (18,294)
Series B conversion to common stock (in shares) (5)          
Series B conversion to common stock $ 0 $ 0 0 0 0 0
Series B conversion to common stock (in shares)   1        
Balance (in shares) at Mar. 31, 2022 1,270 34,179        
Balance at Mar. 31, 2022 $ 1 $ 34 215,439 (339,521) (4,544) (128,591)
Balance (in shares) at Dec. 31, 2022 1,270 35,869        
Balance at Dec. 31, 2022 $ 1 $ 36 232,546 (428,985) (5,452) (201,854)
Issuance of common stock (in shares) 0 668        
Issuance of common stock $ 0 $ 1 2,616 0 0 2,617
Stock options exercised (in shares) 0 40        
Stock options exercised $ 0 $ 0 0 0 0 0
Stock-based compensation $ 0 $ 0 2,662 0 0 2,662
Issuance and exercise of warrants (in shares) 0 113        
Issuance and exercise of warrants $ 0 $ 0 448 0 0 448
Foreign currency translation gain 0 0 0 0 117 117
Net loss $ 0 $ 0 0 (26,410) 0 (26,410)
Balance (in shares) at Mar. 31, 2023 1,270 36,690        
Balance at Mar. 31, 2023 $ 1 $ 37 $ 238,272 $ (455,395) $ (5,335) $ (222,420)