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Basis of Presentation and Summary of Significant Accounting Policies - Summary of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]        
Cash and cash equivalents $ 241,126 $ 78,446 $ 62,031  
Restricted cash included in other assets 468    
Total cash, cash equivalents and restricted cash presented in the statement of cash flows $ 241,594 $ 78,446 $ 62,031 $ 89,159