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Commitments and Contingencies - Additional Information (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Aug. 14, 2020
May 02, 2018
Loss Contingencies [Line Items]            
Lessee, Finance lease expiration month and year 2023-08   2023-06      
Amortization expense for capital lease $ 106,000 $ 13,000        
Lessee, Operating lease expiration month and year 2024-09   2023-06      
Operating Leases, Rent expense $ 4,200,000 $ 4,500,000 $ 6,000,000.0 $ 4,000,000.0    
Purchase obligation $ 4,000,000   7,700,000     $ 2,600,000
Liabilities subject to compromise early contract termination         $ 1,100,000  
Dispute Settlement [Member]            
Loss Contingencies [Line Items]            
Commitements and contingencies settlement of disputes payable     $ 1,500,000