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Leases - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Operating Leased Assets [Line Items]      
Renewal term 5 years    
Right-of-use asset $ 38,469   $ 4,860
Operating lease liability $ 41,304   $ 6,156
CALIFORNIA      
Operating Leased Assets [Line Items]      
Right-of-use asset   $ 35,700  
Operating lease liability   $ 35,300  
Lease term   10 years  
Discount rate   12.60%  
Minimum      
Operating Leased Assets [Line Items]      
Remaining lease term 1 year    
Maximum      
Operating Leased Assets [Line Items]      
Remaining lease term 10 years