Property, Plant and Equipment, Net (Details) $ in Thousands		9 Months Ended	14 Months Ended
	Jul. 31, 2018 USD ($) ft²	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		$ 56,451	$ 56,451		$ 64,643
Less: Accumulated depreciation and amortization		(3,973)	(3,973)		(1,847)
Property, plant and equipment, net		52,478	52,478	$ 17,654	62,796
Personnel related cost capitalized		1,300
Maximum
Property, Plant and Equipment, Net
Capitalized interest cost		300
Laboratory equipment
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		14,763	14,763		7,122
Land
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		1,300	1,300		1,300
Purchases and additions	$ 1,300
Leasehold improvements
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		446	446		117
Computers and software
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		1,001	1,001		276
Furniture and fixtures
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		1,214	1,214
Construction-in-progress
Property, Plant and Equipment, Net
Property, Plant and Equipment, Gross		37,727	37,727		$ 55,828
Purchases and additions	$ 6,700	11,500
Build-to-suit lease
Property, Plant and Equipment, Net
Derecognition of property and equipment		45,100	45,100
Manufacturing facility
Property, Plant and Equipment, Net
Square footing of facility acquired | ft²	135,000
Purchases and additions	$ 8,000
Technology Service | Construction-in-progress
Property, Plant and Equipment, Net
Purchases and additions		$ 15,300	$ 17,300