Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Period			15 years 10 months 24 days		13 years 1 month 6 days
Finite lived intangible assets: gross carrying amount	$ 13,959		$ 13,959		$ 8,982
Accumulated amortization	(1,219)		(1,219)		(421)
Finite lived intangible assets: net	12,740		12,740		8,561
Indefinite-lived intangible assets	14,544		14,544		15,217
Total intangible assets, gross	28,503		28,503		24,199
Total intangible assets, net	27,284		27,284		23,778
Total amortization of finite lived intangible assets	271	$ 258	828	$ 258
Acquisition of intangible assets from a licensing agreement		2,500	0	2,500
Licensing-related cost, Noncurrent	11,423		$ 11,423		$ 12,717
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Period			15 years		15 years
Finite lived intangible assets: gross carrying amount	6,919		$ 6,919		$ 7,141
Accumulated amortization	(576)		(576)		(238)
Finite lived intangible assets: net	6,343		$ 6,343		$ 6,903
Trade secrets and processes
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Period			20 years
Finite lived intangible assets: gross carrying amount	5,256		$ 5,256
Accumulated amortization	(197)		(197)
Finite lived intangible assets: net	5,059		$ 5,059
Other
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Period			5 years		5 years
Finite lived intangible assets: gross carrying amount	1,784		$ 1,784		$ 1,841
Accumulated amortization	(446)		(446)		(183)
Finite lived intangible assets: net	1,338		1,338		$ 1,658
Technology Licensing Agreement
Finite-Lived Intangible Assets [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)	300		(700)
Contingent Liability Accrual	12,000		12,000
Cost of revenue
Finite-Lived Intangible Assets [Line Items]
Total amortization of finite lived intangible assets	66	0	197	0
Sales, general and administrative
Finite-Lived Intangible Assets [Line Items]
Total amortization of finite lived intangible assets	205	$ 258	631	$ 258
Accrued Liabilities | Technology Licensing Agreement
Finite-Lived Intangible Assets [Line Items]
Contingent Liability Accrual, Current	600		600
Noncurrent Liabilities | Technology Licensing Agreement
Finite-Lived Intangible Assets [Line Items]
Contingent Liability Accrual, Noncurrent	$ 11,400		$ 11,400