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Condensed Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Balances at Dec. 31, 2021 $ 19,727 $ 31 $ 321,669 $ (301,973)
Common Stock Balance, Shares at Dec. 31, 2021   30,790    
Issuance of common stock, net 1,417 $ 1 1,416  
Issuance of common stock, net, Shares   709    
Issuance of common stock under employee stock purchase plan 202   202  
Issuance of common stock under employee stock purchase plan, Shares   99    
Issuance of common stock for deferred offering costs 600   600  
Issuance of common stock for deferred offering costs, Shares   184    
Exercise of stock options 75   75  
Exercise of stock options, shares   107    
Share-based compensation 1,346   1,346  
Net loss (15,586)     (15,586)
Balances at Mar. 31, 2022 7,781 $ 32 325,308 (317,559)
Common Stock Balance, Shares at Mar. 31, 2022   31,889    
Balances at Dec. 31, 2022 20,606 $ 78 387,948 (367,420)
Common Stock Balance, Shares at Dec. 31, 2022   77,614    
Issuance of common stock, net (61)   (61)  
Issuance of common stock under employee stock purchase plan 420   420  
Issuance of common stock under employee stock purchase plan, Shares   270    
Exercise of stock options $ 6   6  
Exercise of stock options, shares 9 9    
Release of restricted stock units, shares   86    
Share-based compensation $ 2,281   2,281  
Net loss (18,702)     (18,702)
Balances at Mar. 31, 2023 $ 4,550 $ 78 $ 390,594 $ (386,122)
Common Stock Balance, Shares at Mar. 31, 2023   77,979