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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of Significant Accounting Policies        
Cash and cash equivalents $ 262,728 $ 25,628    
Restricted Cash included in other long-term assets and other current assets as of December 31, 2020 and 2019, respectively 2,920 2,920    
Cash, cash equivalents and restricted cash $ 265,648 $ 28,548 $ 22,540 $ 7,025