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Cash, Cash Equivalents and Restricted Cash - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash And Cash Equivalents [Abstract]      
Cash and cash equivalents $ 60,161,000 $ 73,773,000  
Restricted cash 18,000 $ 0 $ 0
Cash, cash equivalents and restricted cash $ 60,179,000