Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 3,632	$ 3,380
Accumulated depreciation and amortization	(1,616)	(1,019)
Property, plant and equipment, net	$ 2,016	2,361
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	$ 1,026	714
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 290	290
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	$ 1,699	1,636
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