Fixed Assets, net - Schedule of Fixed Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Less accumulated depreciation and amortization	$ (7,549)	$ (7,410)
Total	7,914	8,127
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,290	2,330
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,222	2,218
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 10,951	$ 10,989