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Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Apr. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Restricted Cash        
Restricted cash $ 210   $ 786 $ 786
Reclassification, Other        
Restricted Cash        
Cash and cash equivalents   $ 600    
Security Deposit        
Restricted Cash        
Restricted cash $ 200      
Letter of Credit | Reclassification, Other        
Restricted Cash        
Restricted cash   $ 600