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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, 2020   12,652,308    
Beginning balance at Dec. 31, 2020 $ 41,839 $ 13 $ 223,115 $ (181,289)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of stock in public offering, net of issuance costs of $4,435 (in shares)   4,255,000    
Issuance of stock in public offering, net of issuance costs of $4,435 64,709 $ 4 64,705  
Exercise of stock options (in shares)   3,381    
Exercise of stock options 44   44  
Issuance of stock under Employee Stock Purchase Plan (in shares)   14,991    
Issuance of stock under Employee Stock Purchase Plan 175   175  
Stock-based compensation 912   912  
Net loss (6,209)     (6,209)
Ending balance (in shares) at Mar. 31, 2021   16,925,680    
Ending balance at Mar. 31, 2021 $ 101,470 $ 17 288,951 (187,498)
Beginning balance (in shares) at Dec. 31, 2021 16,164,994 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 and payment of employees' taxes (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 16,231,198    
Ending balance at Mar. 31, 2022 $ 76,156 $ 16 $ 294,552 $ (218,412)