UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue
Total revenue	$ 205,592	$ 196,779	$ 418,138	$ 431,961
Cost of revenue
Total cost of revenue	77,080	73,817	151,517	149,431
Gross profit	128,512	122,962	266,621	282,530
Operating expenses
Selling and marketing	116,962	93,972	225,827	182,355
Research and development	49,714	41,972	100,310	88,757
General and administrative	14,174	10,181	26,850	26,645
Total operating expenses	180,850	146,125	352,987	297,757
(Loss) from operations	(52,338)	(23,163)	(86,366)	(15,227)
Foreign currency transaction gain (loss)	2,105	1,244	(1,607)	159
Interest income, net	544	629	1,267	1,393
Other income, net	55	0	55	363
(Loss) before (benefit from) income taxes	(49,634)	(21,290)	(86,651)	(13,312)
(Benefit from) income taxes	(17,338)	(10,881)	(25,638)	(15,103)
Net (loss) income	$ (32,296)	$ (10,409)	$ (61,013)	$ 1,791
(Loss) earnings per share
Basic (in dollars per share)	$ (0.41)	$ (0.13)	$ (0.77)	$ 0.02
Diluted (in dollars per share)	$ (0.41)	$ (0.13)	$ (0.77)	$ 0.02
Weighted-average number of common shares outstanding
Basic (in shares)	78,987	78,635	78,787	78,436
Diluted (in shares)	78,987	78,635	78,787	83,247
Software license
Revenue
Total revenue	$ 44,274	$ 44,784	$ 107,538	$ 132,557
Cost of revenue
Total cost of revenue	928	1,262	2,306	2,517
Maintenance
Revenue
Total revenue	69,329	65,906	137,035	130,431
Cost of revenue
Total cost of revenue	6,292	5,874	12,627	11,956
Services
Revenue
Total revenue	91,989	86,089	173,565	168,973
Cost of revenue
Total cost of revenue	$ 69,860	$ 66,681	$ 136,584	$ 134,958