Furniture, Fixtures and Equipment, Net - Furniture, Fixtures and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 10,102	$ 5,091
Less: Accumulated depreciation	(2,245)	(1,275)
Property and equipment, net	$ 7,857	$ 3,816
Manufacturing Equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	10 years	10 years
Property and equipment, gross	$ 4,384	$ 988
Laboratory Equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	7 years	7 years
Property and equipment, gross	$ 2,537	$ 1,619
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	5 years	5 years
Property and equipment, gross	$ 808	$ 491
Software and computer equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	3 years	3 years
Property and equipment, gross	$ 1,732	$ 1,695
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 641	$ 298