CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allocated share-based compensation expense	$ 14,782	$ 98,812	$ 45,047	$ 116,104
Amortization of acquisition intangible assets	2,521	1,053	5,715	3,237
Cost of revenue
Allocated share-based compensation expense	718	6,472	2,805	7,776
Amortization of acquisition intangible assets	1,557	488	3,448	1,464
Research and development
Allocated share-based compensation expense	5,468	37,490	15,863	43,903
Sales and marketing
Allocated share-based compensation expense	2,918	14,496	8,714	16,411
Amortization of acquisition intangible assets	964	565	2,267	1,773
General and administrative
Allocated share-based compensation expense	$ 5,678	$ 40,354	$ 17,665	$ 48,014