Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ROU assets, net	$ 23,294
Operating lease liabilities	23,986
Lease expense	$ 2,030
Rent expense related to operating leases		$ 1,200
Weighted-average remaining lease term, operating leases	7 years 2 months 8 days
Weighted-average remaining lease term, financing leases	5 years 29 days
Weighted-average discount rate for operating leases	7.20%
Weighted-average discount rate for financing leases	6.10%
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	$ 1,800
Research, Development And Engineering Expense
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease expense	100
Selling, General and Administrative Expenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease expense	100
Interest Expense
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease expense	$ 100