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Property and Equipment, Net - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Gross property and equipment $ 1,196 $ 983
Accumulated depreciation and amortization (839) (695)
Property and equipment, net 357 288
Property and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Gross property and equipment 1,095 882
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Gross property and equipment $ 101 $ 101