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Statements of Convertible Preferred Stock and Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Convertible preferred stock series A [Member]
Convertible preferred stock series B [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Total
Beginning balance, value at Dec. 31, 2020 $ 5,605 $ 6 $ 74 $ 522,710 $ (206) $ (487,960) $ 34,624
Beginning balance, shares at Dec. 31, 2020 22,513 5,610,121 73,694,203        
Issuance of common stock     $ 1 446     447
Issuance of common stock, shares     298,730        
Share-based compensation       6,753     6,753
Share-based compensation, shares     325,954        
Components of net loss       (7,361) (7,361)
Employee stock purchase plan       89     89
Employee stock purchase plan, shares     14,159        
Preferred stock conversion $ (21)     21     21
Preferred stock conversion, shares (126)   246,152        
Ending balance, value at Sep. 30, 2021 $ 5,584 $ 6 $ 75 530,019 (206) (495,321) 34,573
Ending balance, shares at Sep. 30, 2021 22,387 5,610,121 74,579,198        
Beginning balance, value at Jun. 30, 2021 $ 5,578 $ 6 $ 74 527,294 (206) (490,702) 36,466
Beginning balance, shares at Jun. 30, 2021 22,407 5,610,121 74,428,865        
Issuance of common stock     $ 1 107     108
Issuance of common stock, shares     54,146        
Share-based compensation       2,597     2,597
Share-based compensation, shares     53,454        
Components of net loss       (4,619) (4,619)
Employee stock purchase plan       27     27
Employee stock purchase plan, shares     2,952        
Preferred stock conversion $ 6     (6)     (6)
Preferred stock conversion, shares (20)   39,781        
Ending balance, value at Sep. 30, 2021 $ 5,584 $ 6 $ 75 530,019 (206) (495,321) 34,573
Ending balance, shares at Sep. 30, 2021 22,387 5,610,121 74,579,198        
Beginning balance, value at Dec. 31, 2021 $ 5,584 $ 6 $ 75 532,641 (206) (498,676) 33,840
Beginning balance, shares at Dec. 31, 2021 22,387 5,610,121 74,618,240        
Issuance of common stock       67     67
Issuance of common stock, shares     71,960        
Share-based compensation       7,906     7,906
Share-based compensation, shares     110,726        
Components of net loss     (14,138) (14,138)
Employee stock purchase plan       92     92
Employee stock purchase plan, shares     29,327        
Preferred stock conversion            
Preferred stock conversion, shares (1)   2,025        
Ending balance, value at Sep. 30, 2022 $ 5,584 $ 6 $ 75 540,706 (206) (512,814) 27,767
Ending balance, shares at Sep. 30, 2022 22,386 5,610,121 74,832,278        
Beginning balance, value at Jun. 30, 2022 $ 5,584 $ 6 $ 75 537,963 (206) (507,897) 29,941
Beginning balance, shares at Jun. 30, 2022 22,386 5,610,121 74,686,056        
Issuance of common stock       22     22
Issuance of common stock, shares     31,437        
Share-based compensation       2,695     2,695
Share-based compensation, shares     100,027        
Components of net loss     (4,917) (4,917)
Employee stock purchase plan       26     26
Employee stock purchase plan, shares     14,758        
Ending balance, value at Sep. 30, 2022 $ 5,584 $ 6 $ 75 $ 540,706 $ (206) $ (512,814) $ 27,767
Ending balance, shares at Sep. 30, 2022 22,386 5,610,121 74,832,278