Consolidated statements of operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue
Software	$ 72,813	$ 59,600	$ 140,956	$ 113,697
Software related services	8,707	8,204	18,180	17,175
Total software	81,520	67,804	159,136	130,872
Client engineering services	12,417	12,365	24,497	24,594
Other	1,629	1,477	3,664	3,062
Total revenue	95,566	81,646	187,297	158,528
Cost of revenue
Software	11,983	8,729	22,905	17,633
Software related services	6,512	7,114	13,221	13,773
Total software	18,495	15,843	36,126	31,406
Client engineering services	9,960	9,828	20,160	19,969
Other	1,001	1,247	2,212	2,297
Total cost of revenue	29,456	26,918	58,498	53,672
Gross profit	66,110	54,728	128,799	104,856
Operating expenses:
Research and development	24,744	22,838	47,447	41,608
Sales and marketing	20,183	19,428	39,160	36,338
General and administrative	17,412	21,201	34,402	37,290
Amortization of intangible assets	1,986	1,155	3,926	2,098
Other operating income	(392)	(2,736)	(2,583)	(3,330)
Total operating expenses	63,933	61,886	122,352	114,004
Operating income (loss)	2,177	(7,158)	6,447	(9,148)
Interest expense	45	548	61	1,159
Other (income) expense, net	(176)	427	(1,076)	786
Income (loss) before income taxes	2,308	(8,133)	7,462	(11,093)
Income tax expense (benefit)	795	(887)	2,029	(1,659)
Net income (loss)	$ 1,513	$ (7,246)	$ 5,433	$ (9,434)
Income (loss) per share:
Net income (loss) per share attributable to common stockholders, basic	$ 0.02	$ (0.14)	$ 0.08	$ (0.19)
Net income (loss) per share attributable to common stockholders, diluted	$ 0.02	$ (0.14)	$ 0.07	$ (0.19)
Weighted average shares outstanding:
Weighted average number of shares used in computing net income (loss) per share, basic	65,580	50,374	64,614	50,255
Weighted average number of shares used in computing net income (loss) per share, diluted	73,391	50,374	72,881	50,255