Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 71,408	$ 70,829
Less: Accumulated depreciation	(18,125)	(16,569)
Property, plant and equipment, net	53,283	54,260
Manufacturing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,822	21,705
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,391	7,948
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,681	1,681
Software, computer and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,838	7,836
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	30,433	30,178
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,243	$ 1,481