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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Variable Interest Entity [Line Items]          
Redemption value adjustment     $ (1,651,000)    
Loan to minority shareholders included in temporary equity $ 4,400,000   4,400,000   $ 4,400,000
Restricted cash 1,900,000   1,900,000   2,000,000
Transaction gains (losses) included in selling, general and administrative expense (700,000) $ 1,000,000 (1,900,000) $ 2,600,000  
Retained Earnings          
Variable Interest Entity [Line Items]          
Redemption value adjustment     $ (1,651,000)    
VIE          
Variable Interest Entity [Line Items]          
Ownership percentage     40.00%    
Outstanding borrowings $ 0   $ 0   $ 0