CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Allocated share-based compensation expense	$ 98,812	$ 8,422	$ 116,104	$ 26,363
Amortization of acquisition intangible assets	1,053	1,092	3,237	3,369
Cost of revenue
Allocated share-based compensation expense	6,472	634	7,776	1,870
Amortization of acquisition intangible assets	488	488	1,464	1,552
Research and development
Allocated share-based compensation expense	37,490	2,799	43,903	7,065
Sales and marketing
Allocated share-based compensation expense	14,496	1,322	16,411	6,622
Amortization of acquisition intangible assets	565	604	1,773	1,817
General and administrative
Allocated share-based compensation expense	$ 40,354	$ 3,667	$ 48,014	$ 10,806