Property, Plant and Equipment, Net (Details) $ in Thousands	Jul. 31, 2018 USD ($) ft²	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		$ 62,044	$ 61,365
Less: Accumulated depreciation and amortization		(5,661)	(4,441)
Property, plant and equipment, net		56,383	56,924
Manufacturing facility
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		30,539
Square footing of facility acquired | ft²	135,000
Purchases and additions	$ 8,000
Construction-in-progress		30,500
Manufacturing equipment
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		8,587
Construction-in-progress		7,800
Land
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		1,300	1,300
Purchases and additions	1,300
Laboratory equipment
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		15,622	16,079
Computer equipment
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		1,754	1,051
Furniture and fixtures
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		1,228	1,228
Leasehold improvements
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		445	445
Construction-in-progress
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		$ 2,569	$ 41,262
Purchases and additions	$ 6,700