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Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]        
Cash and cash equivalents $ 14,588 $ 15,666    
Restricted cash 3,927 4,673    
Cash and cash equivalents and restricted cash—end of period $ 18,515 $ 20,339 $ 114,602 $ 11,864