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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 225,798	$ 226,259
Accumulated Amortization	110,412	100,205
Net	$ 115,386	$ 126,054
Domain Names
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life - Years	1 year 6 months	1 year 7 months 6 days
Gross Carrying Amount	$ 5,414	$ 5,414
Accumulated Amortization	4,554	4,283
Net	$ 860	$ 1,131
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life - Years	1 year 2 months 12 days	1 year 4 months 24 days
Gross Carrying Amount	$ 5,772	$ 5,772
Accumulated Amortization	4,407	4,076
Net	$ 1,365	$ 1,696
Acquired Developed Technology
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life - Years	3 years 7 months 6 days	3 years 9 months 18 days
Gross Carrying Amount	$ 179,330	$ 179,791
Accumulated Amortization	86,899	78,729
Net	$ 92,431	$ 101,062
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life - Years	2 years	2 years 1 month 6 days
Gross Carrying Amount	$ 15,572	$ 15,572
Accumulated Amortization	8,893	8,012
Net	$ 6,679	$ 7,560
Patents
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life - Years	6 years 7 months 6 days	6 years 10 months 24 days
Gross Carrying Amount	$ 19,710	$ 19,710
Accumulated Amortization	5,659	5,105
Net	$ 14,051	$ 14,605

X

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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