Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property and equipment [Line Items]
Property and equipment, gross	$ 22,291	$ 14,454
Less accumulated depreciation	(8,505)	(4,979)
Property and equipment, net	13,786	9,475
Other liabilities	821	1,148
Depreciation expense	3,333	1,799	$ 1,197
Leasehold improvements
Property and equipment [Line Items]
Property and equipment, gross	3,274	2,684
Lab and clean room equipment
Property and equipment [Line Items]
Property and equipment, gross	8,666	4,564
Furniture and equipment
Property and equipment [Line Items]
Property and equipment, gross	7,051	4,577
Construction in Progress
Property and equipment [Line Items]
Property and equipment, gross	3,300	2,629
Capital leases
Property and equipment [Line Items]
Property and equipment, net	427
Other liabilities	31
Leasehold improvements paid for by landlord
Property and equipment [Line Items]
Property and equipment, net	1,000
Other liabilities	$ 188	$ 361