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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning Balance at Dec. 31, 2019 $ 345,359 $ 5 $ 503,475 $ 10 $ (158,131)
Beginning balance, shares at Dec. 31, 2019   44,413,404      
Issuance of common stock upon exercise of stock options 159 $ 0 159 0 0
Issuance of common stock upon exercise of stock options, shares   39,297      
Stock-based compensation expense 6,082   6,082    
Other comprehensive income (loss) 479   0 479  
Net loss (24,392)       (24,392)
Ending Balance at Mar. 31, 2020 327,687 $ 5 509,716 489 (182,523)
Ending balance, shares at Mar. 31, 2020   44,452,701      
Beginning Balance at Dec. 31, 2019 345,359 $ 5 503,475 10 (158,131)
Beginning balance, shares at Dec. 31, 2019   44,413,404      
Other comprehensive income (loss) 235        
Net loss (86,513)        
Ending Balance at Sep. 30, 2020 281,780 $ 5 526,174 245 (244,644)
Ending balance, shares at Sep. 30, 2020   44,760,513      
Beginning Balance at Mar. 31, 2020 327,687 $ 5 509,716 489 (182,523)
Beginning balance, shares at Mar. 31, 2020   44,452,701      
Issuance of common stock upon exercise of stock options 720   720 0 0
Issuance of common stock upon exercise of stock options, shares   203,373      
Issuance of common stock upon vesting of restricted stock units, net of taxes withheld (206)   (206)    
Issuance of common stock upon vesting of restricted stock units, net of taxes withheld, shares   10,942      
Stock-based compensation expense 6,890   6,890    
Other comprehensive income (loss) 105     105  
Net loss (25,999)       (25,999)
Ending Balance at Jun. 30, 2020 309,197 $ 5 517,120 594 (208,522)
Ending balance, shares at Jun. 30, 2020   44,667,016      
Issuance of common stock upon exercise of stock options 813   813    
Issuance of common stock upon exercise of stock options, shares   93,497      
Stock-based compensation expense 8,241   8,241    
Other comprehensive income (loss) (349)     (349)  
Net loss (36,122)       (36,122)
Ending Balance at Sep. 30, 2020 281,780 $ 5 526,174 245 (244,644)
Ending balance, shares at Sep. 30, 2020   44,760,513      
Beginning Balance at Dec. 31, 2020 860,751 $ 5 1,151,920 53 (291,227)
Beginning balance, shares at Dec. 31, 2020   51,112,302      
Issuance of common stock upon exercise of stock options 1,483   1,483    
Issuance of common stock upon exercise of stock options, shares   113,559      
Stock-based compensation expense 9,925   9,925    
Other comprehensive income (loss) (35)     (35)  
Net loss (50,447)       (50,447)
Ending Balance at Mar. 31, 2021 821,677 $ 5 1,163,328 18 (341,674)
Ending balance, shares at Mar. 31, 2021   51,225,861      
Beginning Balance at Dec. 31, 2020 860,751 $ 5 1,151,920 53 (291,227)
Beginning balance, shares at Dec. 31, 2020   51,112,302      
Other comprehensive income (loss) (53)        
Net loss (173,825)        
Ending Balance at Sep. 30, 2021 726,320 $ 5 1,191,367 0 (465,052)
Ending balance, shares at Sep. 30, 2021   51,698,775      
Beginning Balance at Mar. 31, 2021 821,677 $ 5 1,163,328 18 (341,674)
Beginning balance, shares at Mar. 31, 2021   51,225,861      
Issuance of common stock upon exercise of stock options 2,228   2,228    
Issuance of common stock upon exercise of stock options, shares   131,276      
Issuance of common stock upon vesting of restricted stock units, net of taxes withheld, shares   72,976      
Issuance of common stock pursuant to employee stock purchase plans 305   305    
Issuance of common stock pursuant to employee stock purchase plans, shares   4,295      
Stock-based compensation expense 11,087   11,087    
Other comprehensive income (loss) (18)     (18)  
Net loss (55,852)       (55,852)
Ending Balance at Jun. 30, 2021 779,427 $ 5 1,176,948 0 (397,526)
Ending balance, shares at Jun. 30, 2021   51,434,408      
Issuance of common stock upon exercise of stock options 2,042   2,042    
Issuance of common stock upon exercise of stock options, shares   103,585      
Issuance of common stock upon vesting of restricted stock units, net of taxes withheld, shares   10,799      
Issuance of common stock upon exercise of common stock warrant, shares   149,983      
Stock-based compensation expense 12,377   12,377    
Other comprehensive income (loss) 0        
Net loss (67,526)       (67,526)
Ending Balance at Sep. 30, 2021 $ 726,320 $ 5 $ 1,191,367 $ 0 $ (465,052)
Ending balance, shares at Sep. 30, 2021   51,698,775