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Stockholders' Equity - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2019
Jun. 30, 2014
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Class Of Stock [Line Items]                
Proceeds from issuance of common stock $ 162,200,000              
Shares of common stock issued pursuant to exercise of stock options             124,000  
Proceeds from stock option exercises             $ 1,309,000 $ 16,215,000
Total unrecognized compensation cost related to non-vested, stock-based payment awards     $ 103,000,000.0       $ 103,000,000.0  
Total unrecognized compensation cost, expect to recognize over weighted average period             2 years 8 months 12 days  
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     54,000 70,000 810,000 732,000    
Common Stock | Pre-funded Warrants                
Class Of Stock [Line Items]                
Issuance of common stock on exercise of warrants (in shares)             267,870