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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 188,262	$ 205,782
Accumulated Amortization	100,977	113,661
Net	$ 87,285	$ 92,121
Domain Names
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Life - Years	2 years 1 month 6 days	2 years 7 months 6 days
Gross Carrying Amount	$ 414	$ 5,414
Accumulated Amortization	241	5,200
Net	$ 173	$ 214
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Life - Years		0 years
Gross Carrying Amount		$ 3,072
Accumulated Amortization		$ 3,072
Acquired Developed Technology
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Life - Years	3 years 1 month 6 days	3 years 7 months 6 days
Gross Carrying Amount	$ 167,988	$ 175,414
Accumulated Amortization	92,715	95,921
Net	$ 75,273	$ 79,493
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Life - Years		0 years
Gross Carrying Amount		$ 2,172
Accumulated Amortization		$ 2,172
Patents
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Life - Years	5 years 4 months 24 days	5 years 10 months 24 days
Gross Carrying Amount	$ 19,860	$ 19,710
Accumulated Amortization	8,021	7,296
Net	$ 11,839	$ 12,414

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