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Summary of Significant Accounting Policies (Details) - Schedule of cash, cash equivalents, and restricted cash - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Schedule of cash, cash equivalents, and restricted cash [Abstract]        
Cash and cash equivalents $ 40,742 $ 168,598 $ 165,905  
Restricted cash, current 50 50  
Restricted cash, non-current 745    
Total cash, cash equivalents, and restricted cash $ 41,487 $ 169,393 $ 165,955 $ 564