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Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents $ 54,318 $ 14,337 $ 8,427  
Restricted cash 1,488   579  
Cash and cash equivalents, and restricted cash $ 55,806 $ 15,260 $ 9,006 $ 19,011