Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.21.1
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Subsidiary, Sale of Stock [Line Items]      
Cash, cash equivalents, and restricted cash | $ $ 93,314 $ 42,193 $ 11,767
Operating segments (number) | Segment 1    
ASU 2018-13      
Subsidiary, Sale of Stock [Line Items]      
Change in Accounting Principle, Accounting Standards Update, Adopted true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date Dec. 31, 2020    
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true    
Accounting Standards Update [Extensible List] ASU 2018-13    
6.0% April 2020 and March 2019 Convertible Senior Notes      
Subsidiary, Sale of Stock [Line Items]      
Interest rate 6.00%