Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 69,352	$ 68,630
Less: Accumulated depreciation	(12,129)	(10,483)
Property, plant and equipment, net	57,223	58,147
Manufacturing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,475	18,073
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,734	7,525
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,663	1,648
Software, computer and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,985	7,772
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	29,832	29,720
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 663	$ 3,892