Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.20.2
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended 9 Months Ended
Aug. 07, 2020
Jul. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Class Of Warrant Or Right [Line Items]        
Net proceeds from common stock     $ 48,372 $ 0
Sale of securities $ 300,000      
At-the-market Sales (“ATM”)        
Class Of Warrant Or Right [Line Items]        
Gross proceeds from common stock   $ 50,000    
Net proceeds from common stock $ 100,000 $ 48,500    
At-the-market Sales (“ATM”) | Common Stock at Purchase Price of $12.00 Per Share        
Class Of Warrant Or Right [Line Items]        
Number of shares sold   3.6    
Purchase price per share   $ 12.00    
At-the-market Sales (“ATM”) | Common Stock at Purchase Price of $12.70 Per Share        
Class Of Warrant Or Right [Line Items]        
Number of shares sold   0.5    
Purchase price per share   $ 12.70