Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Cash, Cash Equivalents, and Restricted Cash (Detail)

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Summary of Significant Accounting Policies - Summary of Cash, Cash Equivalents, and Restricted Cash (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 245,770 $ 15,571    
Restricted cash, current 12,801 0    
Restricted cash included in Other long-term assets 396 415    
Cash, cash equivalents, restricted cash and restricted cash equivalents $ 258,967 $ 15,986 $ 11,205 $ 24,531