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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common stock
Treasury Stock, Common
Additional paid-in capital
Accumulated deficit
Accumulated other comprehensive loss
Total stockholders' equity
Beginning balance (in shares) at Dec. 31, 2021   126,925,104          
Beginning balance at Dec. 31, 2021 $ 85,274 $ 13 $ (4,881)   $ (412,776) $ 0 $ (322,634)
Treasury stock, beginning balance (in shares) at Dec. 31, 2021     7,685,190        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expenses 11,897       11,897    
Issuance of common stock upon exercise of stock options (in shares)   3,661,650          
Issuance of common stock upon exercise of stock options, and vesting of restricted stock units 1,364 $ 0     1,364    
Other comprehensive income (1,194)         (1,194)  
Net loss (34,273)           (34,273)
Ending balance (in shares) at Jun. 30, 2022   130,586,754          
Ending balance at Jun. 30, 2022 63,068 $ 13 $ (4,881)   426,037 (1,194) (356,907)
Treasury stock, ending balance (in shares) at Jun. 30, 2022     7,685,190        
Beginning balance (in shares) at Mar. 31, 2022   127,648,228          
Beginning balance at Mar. 31, 2022   $ 13 $ 4,881 $ 418,826 (339,560) 523 74,921
Treasury stock, beginning balance (in shares) at Mar. 31, 2022     7,685,190        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expenses 6,145       6,145    
Issuance of common stock upon exercise of stock options (in shares)   2,938,526          
Issuance of common stock upon exercise of stock options, and vesting of restricted stock units 1,066 $ 0     1,066    
Other comprehensive income (1,717)         (1,717)  
Net loss (17,347)           (17,347)
Ending balance (in shares) at Jun. 30, 2022   130,586,754          
Ending balance at Jun. 30, 2022 $ 63,068 $ 13 $ (4,881)   426,037 (1,194) (356,907)
Treasury stock, ending balance (in shares) at Jun. 30, 2022     7,685,190        
Beginning balance (in shares) at Dec. 31, 2022 134,564,429 134,564,429          
Beginning balance at Dec. 31, 2022 $ 43,346 $ 13 $ 4,881   439,644 (301) (391,129)
Treasury stock, beginning balance (in shares) at Dec. 31, 2022     7,685,190        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expenses 14,959       14,959    
Issuance of common stock upon exercise of stock options (in shares)   3,229,049          
Issuance of common stock upon exercise of stock options, and vesting of restricted stock units 751 $ 0     751    
Other comprehensive income 40         40  
Net loss $ (23,573)           (23,573)
Ending balance (in shares) at Jun. 30, 2023 137,793,478 137,793,478          
Ending balance at Jun. 30, 2023 $ 35,523 $ 13 $ (4,881)   455,354 (261) (414,702)
Treasury stock, ending balance (in shares) at Jun. 30, 2023 7,685,190   7,685,190        
Beginning balance (in shares) at Mar. 31, 2023   135,695,254          
Beginning balance at Mar. 31, 2023 $ 37,971 $ 13 $ (4,881)   447,316 (553) (403,924)
Treasury stock, beginning balance (in shares) at Mar. 31, 2023     7,685,190        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expenses 7,668       7,668    
Issuance of common stock upon exercise of stock options (in shares)   2,098,224          
Issuance of common stock upon exercise of stock options, and vesting of restricted stock units 370 $ 0     370    
Other comprehensive income 292         292  
Net loss $ (10,778)           (10,778)
Ending balance (in shares) at Jun. 30, 2023 137,793,478 137,793,478          
Ending balance at Jun. 30, 2023 $ 35,523 $ 13 $ (4,881)   $ 455,354 $ (261) $ (414,702)
Treasury stock, ending balance (in shares) at Jun. 30, 2023 7,685,190   7,685,190