Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ROU assets, net	$ 21,644	$ 21,644
Operating lease liabilities	22,433	22,433
Lease expense	2,017	5,956
Rent expense under operating leases	$ 1,300	$ 3,800
Weighted-average remaining lease term, financing lease	4 years 9 months 11 days	4 years 9 months 11 days
Weighted-average remaining lease term, operating lease	7.20%	7.20%
Weighted-average discount rate for financing lease	6.80%	6.80%
Weighted-average discount rate for operating lease	6 years 10 months 10 days	6 years 10 months 10 days
ASC 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ROU assets, net			$ 24,600
Operating lease liabilities			$ 25,100
Cost of Sales
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease expense	$ 1,600	$ 5,200
Research, Development And Engineering Expense
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease expense	300	500
Selling, General and Administrative Expenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease expense	$ 100	200
Interest Expense
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease expense		$ 100