CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Allocated share-based compensation expense	$ 15,154	$ 8,752	$ 30,265	$ 17,292
Amortization of acquisition intangible assets	2,169	1,092	3,194	2,184
Cost of revenue
Allocated share-based compensation expense	991	646	2,087	1,304
Amortization of acquisition intangible assets	1,403	488	1,891	976
Research and development
Allocated share-based compensation expense	5,629	2,966	10,395	6,413
Sales and marketing
Allocated share-based compensation expense	3,016	1,147	5,796	1,915
Amortization of acquisition intangible assets	766	604	1,303	1,208
General and administrative
Allocated share-based compensation expense	$ 5,518	$ 3,993	$ 11,987	$ 7,660