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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

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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