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Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Accounting Policies [Abstract]      
Cash and cash equivalents $ 178,003 $ 53,774 $ 77,559
Restricted cash 1,274 $ 1,274 1,274
Total cash, cash equivalents and restricted cash $ 179,277   $ 78,833