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Unaudited Condensed Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2021   16,164,994    
Beginning balance at Dec. 31, 2021 $ 84,936 $ 16 $ 293,060 $ (208,140)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of stock from vested restricted stock units and payment of employees' taxes (in shares)   30,523    
Issuance of stock from vested restricted stock units (115)   (115)  
Issuance of stock under Employee Stock Purchase Plan (in shares)   35,681    
Issuance of stock under Employee Stock Purchase Plan 231   231  
Stock-based compensation 1,376   1,376  
Net loss (10,272)     (10,272)
Ending balance (in shares) at Mar. 31, 2022   16,231,198    
Ending balance at Mar. 31, 2022 $ 76,156 $ 16 294,552 (218,412)
Beginning balance (in shares) at Dec. 31, 2022 16,549,984 16,549,984    
Beginning balance at Dec. 31, 2022 $ 42,460 $ 17 297,970 (255,527)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of stock from vested restricted stock units and payment of employees' taxes (in shares)   113,378    
Issuance of stock from vested restricted stock units 0   0  
Issuance of stock under Employee Stock Purchase Plan (in shares)   70,317    
Issuance of stock under Employee Stock Purchase Plan 152   152  
Exercise of stock options (in shares)   93,335    
Exercise of stock options 27   27  
Stock-based compensation 986   986  
Net loss $ (7,688)     (7,688)
Ending balance (in shares) at Mar. 31, 2023 16,827,014 16,827,014    
Ending balance at Mar. 31, 2023 $ 35,937 $ 17 $ 299,135 $ (263,215)