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Summary of Significant Accounting Policies - Cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]        
Cash and cash equivalents $ 76,387 $ 99,442    
Restricted cash 100 100    
Total Cash, Cash Equivalents and Restricted Cash $ 76,487 $ 99,542 $ 112,676 $ 57,548