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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020   2,597,000        
Beginning balance at Dec. 31, 2020 $ 4,255 $ 0 $ 0 $ 135,113 $ (3) $ (130,855)
Beginning balance (in shares) at Dec. 31, 2020     3,525,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee stock option and stock purchase plans (in shares)     1,000      
Stock-based compensation 140     140    
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (2)     (2)    
Issuance of common stock upon the exercise of warrants (in shares)     156,000      
Issuance of common stock upon the exercise of warrants 527     527    
Net loss (1,642)         (1,642)
Ending balance (in shares) at Mar. 31, 2021   2,597,000        
Ending balance at Mar. 31, 2021 3,278 $ 0 $ 0 135,778 (3) (132,497)
Ending balance (in shares) at Mar. 31, 2021     3,682,000      
Beginning balance (in shares) at Dec. 31, 2020   2,597,000        
Beginning balance at Dec. 31, 2020 4,255 $ 0 $ 0 135,113 (3) (130,855)
Beginning balance (in shares) at Dec. 31, 2020     3,525,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (4,115)          
Ending balance (in shares) at Jun. 30, 2021   876,000        
Ending balance at Jun. 30, 2021 5,603 $ 0 $ 0 140,576 (3) (134,970)
Ending balance (in shares) at Jun. 30, 2021     5,085,000      
Beginning balance (in shares) at Dec. 31, 2020   2,597,000        
Beginning balance at Dec. 31, 2020 4,255 $ 0 $ 0 135,113 (3) (130,855)
Beginning balance (in shares) at Dec. 31, 2020     3,525,000      
Ending balance (in shares) at Dec. 31, 2021   876,000        
Ending balance at Dec. 31, 2021 $ 6,209 $ 0 $ 0 144,953 (3) (138,741)
Ending balance (in shares) at Dec. 31, 2021 6,368,549   6,368,000      
Beginning balance (in shares) at Mar. 31, 2021   2,597,000        
Beginning balance at Mar. 31, 2021 $ 3,278 $ 0 $ 0 135,778 (3) (132,497)
Beginning balance (in shares) at Mar. 31, 2021     3,682,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock (in shares)     990,000      
Issuance of common stock 5,000     5,000    
Issuance of common stock under employee stock option and stock purchase plans (in shares)     69,000      
Issuance of common stock under employee stock option and stock purchase plans 59     59    
Stock-based compensation 208     208    
Offering costs on issuance of common stock and warrants (469)     (469)    
Issuance of common stock upon conversion from preferred stock (in shares)   (1,721,000) 344,000      
Net loss (2,473)         (2,473)
Ending balance (in shares) at Jun. 30, 2021   876,000        
Ending balance at Jun. 30, 2021 5,603 $ 0 $ 0 140,576 (3) (134,970)
Ending balance (in shares) at Jun. 30, 2021     5,085,000      
Beginning balance (in shares) at Dec. 31, 2021   876,000        
Beginning balance at Dec. 31, 2021 $ 6,209 $ 0 $ 0 144,953 (3) (138,741)
Beginning balance (in shares) at Dec. 31, 2021 6,368,549   6,368,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 44     44    
Issuance of common stock upon the exercise of warrants (in shares)     85,000      
Net loss (2,821)         (2,821)
Ending balance (in shares) at Mar. 31, 2022   876,000        
Ending balance at Mar. 31, 2022 3,432 $ 0 $ 0 144,997 (3) (141,562)
Ending balance (in shares) at Mar. 31, 2022     6,453,000      
Beginning balance (in shares) at Dec. 31, 2021   876,000        
Beginning balance at Dec. 31, 2021 $ 6,209 $ 0 $ 0 144,953 (3) (138,741)
Beginning balance (in shares) at Dec. 31, 2021 6,368,549   6,368,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss $ (5,307)          
Ending balance (in shares) at Jun. 30, 2022   876,000        
Ending balance at Jun. 30, 2022 $ 4,171 $ 0 $ 1 148,221 (3) (144,048)
Ending balance (in shares) at Jun. 30, 2022 7,811,460   7,811,000      
Beginning balance (in shares) at Mar. 31, 2022   876,000        
Beginning balance at Mar. 31, 2022 $ 3,432 $ 0 $ 0 144,997 (3) (141,562)
Beginning balance (in shares) at Mar. 31, 2022     6,453,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee stock option and stock purchase plans (in shares)     45,000      
Issuance of common stock under employee stock option and stock purchase plans 5     5    
Stock-based compensation 54     54    
Issuance of common stock upon the exercise of warrants (in shares)     1,313,000      
Issuance of common stock upon the exercise of warrants 3,500   $ 1 3,499    
Offering costs on issuance of common stock and warrants (334)     (334)    
Net loss (2,486)         (2,486)
Ending balance (in shares) at Jun. 30, 2022   876,000        
Ending balance at Jun. 30, 2022 $ 4,171 $ 0 $ 1 $ 148,221 $ (3) $ (144,048)
Ending balance (in shares) at Jun. 30, 2022 7,811,460   7,811,000