Annual report pursuant to Section 13 and 15(d)

Organization and Description of Business - Additional Information (Detail)

v3.21.1
Organization and Description of Business - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2019
USD ($)
Jul. 31, 2020
USD ($)
Jul. 13, 2020
USD ($)
Class of Stock [Line Items]        
Common Stock, Value, Registered For Issuance       $ 200,000
Number of operating segments | Segment 1      
Net loss $ (50,986) $ (102,808)    
Cash flows from operating activities (44,725) (97,911)    
Accumulated deficit (676,858) $ (625,872)    
Cash and cash equivalents and marketable securities $ 146,300      
ATM Offering [Member]        
Class of Stock [Line Items]        
Common stock value subscribed     $ 75,000 $ 75,000
Common Stock, Value, Registered For Issuance     $ 200,000