Balance Sheet Account Detail - Schedule of Property and Equipment Net of Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 17,619	$ 6,883
(Less): Accumulated depreciation	(6,012)	(6,498)
Property and equipment, net of accumulated depreciation	11,607	385
Manufacturing equipment
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	10,355	0
Computers hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	3,606	3,079
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	36	635
Office furniture
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	248	212
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 3,374	$ 2,957