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- Intangible Assets with Definite Lives (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Intangible assets with definite lives |  |
Gross Carrying Amount | $ 435,826 | $ 347,177
Accumulated Amortization | (237,567) | (215,198)
Total | $ 198,259 | $ 131,979
Weighted-Average Useful Life (Years) | 4 years | 3 years 9 months 18 days
Technology |  |
Intangible assets with definite lives |  |
Gross Carrying Amount | $ 203,737 | $ 154,052
Accumulated Amortization | (87,442) | (79,358)
Total | $ 116,295 | $ 74,694
Weighted-Average Useful Life (Years) | 4 years 8 months 12 days | 4 years 7 months 6 days
Service professional relationships |  |
Intangible assets with definite lives |  |
Gross Carrying Amount | $ 99,850 | $ 99,651
Accumulated Amortization | (83,560) | (76,445)
Total | $ 16,290 | $ 23,206
Weighted-Average Useful Life (Years) | 3 years | 2 years 10 months 24 days
Customer lists and user base |  |
Intangible assets with definite lives |  |
Gross Carrying Amount | $ 79,768 | $ 44,548
Accumulated Amortization | (26,804) | (24,488)
Total | $ 52,964 | $ 20,060
Weighted-Average Useful Life (Years) | 4 years | 3 years 3 months 18 days
Trade names |  |
Intangible assets with definite lives |  |
Gross Carrying Amount | $ 21,868 | $ 19,074
Accumulated Amortization | (15,544) | (13,068)
Total | $ 6,324 | $ 6,006
Weighted-Average Useful Life (Years) | 2 years 8 months 12 days | 3 years 2 months 12 days
Memberships |  |
Intangible assets with definite lives |  |
Gross Carrying Amount | $ 15,900 | $ 15,900
Accumulated Amortization | (13,264) | (11,940)
Total | $ 2,636 | $ 3,960
Weighted-Average Useful Life (Years) | 3 years | 3 years
Other |  |
Intangible assets with definite lives |  |
Gross Carrying Amount | $ 14,703 | $ 13,952
Accumulated Amortization | (10,953) | (9,899)
Total | $ 3,750 | $ 4,053
Weighted-Average Useful Life (Years) | 3 years 8 months 12 days | 3 years 8 months 12 days

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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://www.xbrl.org/2003/role/disclosureRef -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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