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Stockholders' Equity - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2019
Jun. 30, 2014
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Class Of Stock [Line Items]                    
Payments of stock issuance costs                   $ 110,000
Proceeds from issuance of common stock $ 162,200,000                  
Shares of common stock issued pursuant to exercise of stock options                 159,000  
Proceeds from stock option exercises                 $ 1,833,000 $ 20,239,000
Total unrecognized compensation cost related to non-vested, stock-based payment awards     $ 90,900,000           $ 90,900,000  
Total unrecognized compensation cost, expect to recognize over weighted average period                 2 years 6 months  
Pre-funded Warrants                    
Class Of Stock [Line Items]                    
Class of warrant or right, number of securities called by warrants or rights   600,000                
Class of warrant or right, exercise price of warrants or rights   $ 0.01                
Class of warrant or right, expiration date   Jun. 30, 2021                
Class of warrant or right, exercised during period                 267,870  
Proceeds from issuance of warrants                 $ 2,679  
Class of warrant or right, outstanding     195,574           195,574  
Common Stock                    
Class Of Stock [Line Items]                    
Number of shares issued 9,900,000                  
Share price $ 17.50                  
Payments of stock issuance costs $ 10,300,000                  
Issuance of common stock on exercise of warrants (in shares)         268,000          
Shares of common stock issued pursuant to exercise of stock options     35,000 54,000 70,000 251,000 810,000 732,000    
Common Stock | Pre-funded Warrants                    
Class Of Stock [Line Items]                    
Issuance of common stock on exercise of warrants (in shares)                 267,870