Leases - Components of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Total operating lease cost	$ 3,756	$ 11,519
Cost of goods sold
Lessee, Lease, Description [Line Items]
Total operating lease cost	696	2,304
Selling, general and administrative
Lessee, Lease, Description [Line Items]
Total operating lease cost	2,962	8,742
Research and development
Lessee, Lease, Description [Line Items]
Total operating lease cost	$ 98	$ 473