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Property and Equipment - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 4,700 $ 2,000 $ 900
Loss on disposal (146) 4 $ 0
Finance lease obligations to acquire new office furniture and fixtures and computer hardware 4,475    
Capital leases   0  
Accumulated depreciation for assets under capital lease 700    
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Disposal of property plant and equipment 3,200    
Computer hardware      
Property, Plant and Equipment [Line Items]      
Disposal of property plant and equipment 900 $ 100  
Finance lease obligations to acquire new office furniture and fixtures and computer hardware 800    
Office furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Disposal of property plant and equipment 400    
Finance lease obligations to acquire new office furniture and fixtures and computer hardware 3,700    
Computer software      
Property, Plant and Equipment [Line Items]      
Disposal of property plant and equipment 400    
Equipment      
Property, Plant and Equipment [Line Items]      
Disposal of property plant and equipment $ 100