Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 52,724	$ 48,470
Accumulated Amortization	(38,892)	(36,104)
Net Carrying Amount	13,832	12,366
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	30,447	27,882
Accumulated Amortization	(23,615)	(22,197)
Net Carrying Amount	$ 6,832	$ 5,685
Weighted Average Amortization Period	5 years 3 months	5 years 3 months
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 17,219	$ 15,978
Accumulated Amortization	(11,786)	(10,457)
Net Carrying Amount	$ 5,433	$ 5,521
Weighted Average Amortization Period	8 years 5 months	8 years
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,286	$ 1,289
Accumulated Amortization	(1,286)	(1,283)
Net Carrying Amount	$ 0	$ 6
Weighted Average Amortization Period	2 years 1 month	2 years 1 month
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,436	$ 1,439
Accumulated Amortization	(1,436)	(1,439)
Net Carrying Amount	$ 0	$ 0
Weighted Average Amortization Period	2 years 3 months	2 years 3 months
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,074	$ 1,620
Accumulated Amortization	(534)	(493)
Net Carrying Amount	$ 1,540	$ 1,127
Weighted Average Amortization Period	12 years 5 months	13 years 1 month
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 262	$ 262
Accumulated Amortization	(235)	(235)
Net Carrying Amount	$ 27	$ 27
Weighted Average Amortization Period	2 years 8 months	2 years 8 months