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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Treasury Stock [Member]
Beginning Balance at Dec. 31, 2020 $ 30,525 $ 236 $ 273,639 $ (241,935) $ (1,415)
Beginning Balance, shares at Dec. 31, 2020   23,694,406      
Issuance of common stock related to vesting of restricted stock (59) $ 1 (60)    
Issuance of common stock related to vesting of restricted stock, shares   43,831      
Issuance of common stock, net 23,229 $ 14 23,215    
Issuance of common stock, net, shares   1,393,738      
Issuance of common stock pursuant to stock option plans 933 $ 2 931    
Issuance of common stock pursuant to stock option plans, shares   138,450      
Issuance of common stock pursuant Employee Stock Purchase Plan 190   190    
Issuance of common stock pursuant Employee Stock Purchase Plan, shares   17,412      
Stock-based compensation 2,102   2,102    
Net loss (7,099)     (7,099)  
Ending Balance at Sep. 30, 2021 49,821 $ 253 300,017 (249,034) (1,415)
Ending Balance, shares at Sep. 30, 2021   25,287,837      
Beginning Balance at Jun. 30, 2021 51,027 $ 251 299,049 (246,858) (1,415)
Beginning Balance, shares at Jun. 30, 2021   25,213,302      
Issuance of common stock related to vesting of restricted stock (59) $ 1 (60)    
Issuance of common stock related to vesting of restricted stock, shares   14,665      
Issuance of common stock, net 297 $ 1 296    
Issuance of common stock, net, shares   54,702      
Issuance of common stock pursuant Employee Stock Purchase Plan 76   76    
Issuance of common stock pursuant Employee Stock Purchase Plan, shares   5,168      
Stock-based compensation 656   656    
Net loss (2,176)     (2,176)  
Ending Balance at Sep. 30, 2021 49,821 $ 253 300,017 (249,034) (1,415)
Ending Balance, shares at Sep. 30, 2021   25,287,837      
Beginning Balance at Dec. 31, 2021 46,517 $ 253 300,859 (253,180) (1,415)
Beginning Balance, shares at Dec. 31, 2021   25,326,086      
Issuance of common stock related to vesting of restricted stock 0 $ 0 0    
Issuance of common stock related to vesting of restricted stock, shares   875      
Issuance of common stock pursuant to stock option plans $ 206 $ 1 205    
Issuance of common stock pursuant to stock option plans, shares 73,500 73,833      
Issuance of common stock pursuant Employee Stock Purchase Plan $ 127 $ 0 127    
Issuance of common stock pursuant Employee Stock Purchase Plan, shares   28,141      
Stock-based compensation 1,369   1,369    
Net loss (10,561)     (10,561)  
Ending Balance at Sep. 30, 2022 37,658 $ 254 302,560 (263,741) (1,415)
Ending Balance, shares at Sep. 30, 2022   25,428,935      
Beginning Balance at Jun. 30, 2022 40,990 $ 254 301,994 (259,843) (1,415)
Beginning Balance, shares at Jun. 30, 2022   25,373,858      
Issuance of common stock pursuant to stock option plans 127 $ 0 127    
Issuance of common stock pursuant to stock option plans, shares   45,000      
Issuance of common stock pursuant Employee Stock Purchase Plan 34 $ 0 34    
Issuance of common stock pursuant Employee Stock Purchase Plan, shares   10,077      
Stock-based compensation 405   405    
Net loss (3,898)     (3,898)  
Ending Balance at Sep. 30, 2022 $ 37,658 $ 254 $ 302,560 $ (263,741) $ (1,415)
Ending Balance, shares at Sep. 30, 2022   25,428,935