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Basis of Presentation and Significant Accounting Policies - Schedule of Reconciliation 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 Including Disposal Group And Discontinued Operations [Abstract]        
Cash and cash equivalents $ 94,640 $ 326,028 $ 452,352 $ 189,680
Restricted cash 5,770 5,770 5,770 4,787
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 100,410 $ 331,798 $ 458,122 $ 194,467