Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, beginning balance	$ 67,634	$ 59,516
Accumulated Amortization	(22,921)	(19,304)
Accumulated Impairment Loss	(19,258)	(19,258)
Net Carrying Value, ending balance	$ 25,455	$ 20,954
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	15 years	15 years
Gross Carrying Amount, beginning balance	$ 7,100	$ 7,100
Accumulated Amortization	(1,734)	(1,631)
Accumulated Impairment Loss	(4,179)	(4,179)
Net Carrying Value, ending balance	$ 1,187	$ 1,290
Existing technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	13 years	13 years
Gross Carrying Amount, beginning balance	$ 12,600	$ 12,600
Accumulated Amortization	(4,563)	(4,141)
Accumulated Impairment Loss	(4,328)	(4,328)
Net Carrying Value, ending balance	$ 3,709	$ 4,131
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	11 years	11 years
Gross Carrying Amount, beginning balance	$ 33,500	$ 33,500
Accumulated Amortization	(14,216)	(12,819)
Accumulated Impairment Loss	(10,751)	(10,751)
Net Carrying Value, ending balance	$ 8,533	$ 9,930
Reacquired rights
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	3 years
Gross Carrying Amount, beginning balance	$ 7,500
Accumulated Amortization	(749)
Accumulated Impairment Loss	0
Net Carrying Value, ending balance	$ 6,751
Patents
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	8 years	8 years
Gross Carrying Amount, beginning balance	$ 6,316	$ 6,316
Accumulated Amortization	(1,307)	(713)
Accumulated Impairment Loss	0	0
Net Carrying Value, ending balance	$ 5,009	$ 5,603
Other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	2 years
Gross Carrying Amount, beginning balance	$ 618
Accumulated Amortization	(352)
Accumulated Impairment Loss	0
Net Carrying Value, ending balance	$ 266