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Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 3,380 $ 902
Accumulated depreciation and amortization (1,019) (839)
Property, plant and equipment, net $ 2,361 63
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful Life lesser of useful life or lease term  
Property, plant and equipment $ 714 156
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 290 63
Computer equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful Life 3 years  
Computer equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful Life 5 years  
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful Life 5 years  
Property, plant and equipment $ 1,636 66
Software    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 617 $ 617
Software | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful Life 3 years  
Software | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful Life 5 years  
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 123