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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Balance at the beginning of the period (in shares) at Dec. 31, 2020   2,597 3,525      
Balance at the beginning of the period at Dec. 31, 2020 $ 4,255 $ 0 $ 0 $ 135,113 $ (3) $ (130,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee stock option and stock purchase plans (in shares)     1      
Issuance of common stock under employee stock option and stock purchase plans 0          
Issuance of common stock upon the exercise of warrants (in shares)     156      
Issuance of common stock upon the exercise of warrants 527     527    
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (2)     (2)    
Stock-based compensation 140     140    
Net loss (1,642)         (1,642)
Balance at the end of the period (in shares) at Mar. 31, 2021   2,597 3,682      
Balance at the end of the period at Mar. 31, 2021 3,278 $ 0 $ 0 135,778 (3) (132,497)
Balance at the beginning of the period (in shares) at Dec. 31, 2021   876 6,368      
Balance at the beginning of the period at Dec. 31, 2021 6,209 $ 0 $ 0 144,953 (3) (138,741)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock upon the exercise of warrants (in shares)     85      
Issuance of common stock upon the exercise of warrants 0          
Stock-based compensation 44     44    
Net loss (2,821)         (2,821)
Balance at the end of the period (in shares) at Mar. 31, 2022   876 6,453      
Balance at the end of the period at Mar. 31, 2022 $ 3,432 $ 0 $ 0 $ 144,997 $ (3) $ (141,562)