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Commitment and Contingencies - Commitments Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
office
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
office
Sep. 30, 2020
USD ($)
Operating Leased Assets [Line Items]        
Security deposits $ 200   $ 200  
Rent expense 1,200   3,100  
Sublease revenue 100   200  
Lease abandonment accrual $ 915 $ 0 $ 915 $ 0
Number of offices related to lease abandonment | office 5   5  
Minimum | Related Party        
Operating Leased Assets [Line Items]        
Required monthly payment     $ 3  
Minimum | Third- Party        
Operating Leased Assets [Line Items]        
Required monthly payment     1  
Maximum | Related Party        
Operating Leased Assets [Line Items]        
Required monthly payment     33  
Maximum | Third- Party        
Operating Leased Assets [Line Items]        
Required monthly payment     $ 60