UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue
Total revenue	$ 216,703	$ 203,263	$ 634,841	$ 635,224
Total revenue	216,703	203,263	634,841	635,224
Cost of revenue
Total cost of revenue	80,898	74,423	232,415	223,854
Gross profit	135,805	128,840	402,426	411,370
Operating expenses
Selling and marketing	115,237	87,490	341,064	269,845
Research and development	52,492	46,504	152,802	135,261
General and administrative	14,843	12,104	41,693	38,749
Total operating expenses	182,572	146,098	535,559	443,855
(Loss) from operations	(46,767)	(17,258)	(133,133)	(32,485)
Foreign currency transaction (loss) gain	(1,970)	399	(3,577)	558
Interest income, net	556	683	1,823	2,076
Other income, net	323	0	378	363
(Loss) before (benefit from) income taxes	(47,858)	(16,176)	(134,509)	(29,488)
(Benefit from) income taxes	(17,520)	(8,589)	(43,158)	(23,692)
Net (loss)	$ (30,338)	$ (7,587)	$ (91,351)	$ (5,796)
(Loss) per share
Basic (in dollars per share)	$ (0.38)	$ (0.10)	$ (1.16)	$ (0.07)
Diluted (in dollars per share)	$ (0.38)	$ (0.10)	$ (1.16)	$ (0.07)
Weighted-average number of common shares outstanding
Basic (in shares)	79,200	78,700	78,928	78,525
Diluted (in shares)	79,200	78,700	78,928	78,525
Software license
Revenue
Total revenue	$ 58,005	$ 52,342	$ 165,543	$ 184,899
Cost of revenue
Total cost of revenue	676	1,255	2,982	3,772
Maintenance
Revenue
Total revenue	70,371	66,017	207,406	196,448
Cost of revenue
Total cost of revenue	6,688	6,079	19,315	18,035
Services
Revenue
Total revenue	88,327	84,904	261,892	253,877
Cost of revenue
Total cost of revenue	$ 73,534	$ 67,089	$ 210,118	$ 202,047