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Cash, Cash Equivalents and Restricted Cash - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Cash And Cash Equivalents [Abstract]    
Cash and cash equivalents $ 71,081,000 $ 73,773,000
Restricted cash 322,000 $ 0
Cash, cash equivalents and restricted cash $ 71,403,000