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Condensed Statements of Stockholders' (Deficit) 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, 2021 19,727 $ 31 321,669 (301,973)
Common Stock Balance, Shares at Dec. 31, 2021   30,790    
Net loss (45,109)      
Balances at Sep. 30, 2022 (2,903) $ 41 344,138 (347,082)
Common Stock Balance, Shares at Sep. 30, 2022   41,186    
Balances at Mar. 31, 2022 7,781 $ 32 325,308 (317,559)
Common Stock Balance, Shares at Mar. 31, 2022   31,889    
Issuance of common stock, net 14,329 $ 8 14,321  
Issuance of common stock, net, Shares   7,928    
Exercise of stock options 17   17  
Exercise of stock options, shares   24    
Release of restricted stock units, shares   138    
Share-based compensation 1,368   1,368  
Net loss (15,824)     (15,824)
Balances at Jun. 30, 2022 7,671 $ 40 341,014 (333,383)
Common Stock Balance, Shares at Jun. 30, 2022   39,979    
Issuance of common stock, net 1,745 $ 1 1,744  
Issuance of common stock, net, Shares   924    
Issuance of common stock under employee stock purchase plan 153   153  
Issuance of common stock under employee stock purchase plan, Shares   95    
Exercise of stock options 57   57  
Exercise of stock options, shares   93    
Release of restricted stock units, shares   95    
Share-based compensation 1,170   1,170  
Net loss (13,699)     (13,699)
Balances at Sep. 30, 2022 (2,903) $ 41 344,138 (347,082)
Common Stock Balance, Shares at Sep. 30, 2022   41,186    
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    
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    
Balances at Dec. 31, 2022 $ 20,606 $ 78 387,948 (367,420)
Common Stock Balance, Shares at Dec. 31, 2022   77,614    
Exercise of stock options, shares 122      
Net loss $ (43,007)      
Balances at Sep. 30, 2023 (1,446) $ 88 408,893 (410,427)
Common Stock Balance, Shares at Sep. 30, 2023   88,316    
Balances at Mar. 31, 2023 4,550 $ 78 390,594 (386,122)
Common Stock Balance, Shares at Mar. 31, 2023   77,979    
Exercise of stock options 81   81  
Exercise of stock options, shares   107    
Release of restricted stock units, shares   525    
Release of restricted stock units 1 $ 1    
Issuance of warrants 674   674  
Share-based compensation 1,057   1,057  
Net loss (13,356)     (13,356)
Balances at Jun. 30, 2023 (6,993) $ 79 392,406 (399,478)
Common Stock Balance, Shares at Jun. 30, 2023   78,611    
Issuance of common stock, net 15,316 $ 9 15,307  
Issuance of common stock, net, Shares   9,455    
Issuance of common stock under employee stock purchase plan 223   223  
Issuance of common stock under employee stock purchase plan, Shares   167    
Exercise of stock options 3   3  
Exercise of stock options, shares   6    
Release of restricted stock units, shares   77    
Share-based compensation 954   954  
Net loss (10,949)     (10,949)
Balances at Sep. 30, 2023 $ (1,446) $ 88 $ 408,893 $ (410,427)
Common Stock Balance, Shares at Sep. 30, 2023   88,316