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Fair Value Measurement - Fair Value for Loan Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans Receivable, Net $ 0 $ 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans Receivable, Net 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans Receivable, Net $ 119,895 $ 89,790