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Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies        
Cash and cash equivalents $ 200,512 $ 326,744    
Restricted cash included in prepaid expense and other current assets $ 5,131 $ 4,231    
Restricted Cash, Statement of Financial Position us-gaap:PrepaidExpenseAndOtherAssets us-gaap:PrepaidExpenseAndOtherAssets    
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 205,643 $ 330,975 $ 123,443 $ 153,255