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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies        
Cash and cash equivalents $ 131,777 $ 24,930 $ 52,856  
Restricted cash 121   235  
Total $ 131,898 $ 25,051 $ 53,091 $ 10,376