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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash - Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash, Cash Equivalents, and Short-term Investments [Abstract]        
Cash and cash equivalents $ 163,240 $ 142,837 $ 79,749  
Restricted cash 2,922 3,506 2,626  
Cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows $ 166,162 $ 146,343 $ 82,375 $ 51,237