Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total revenue	$ 131,463	$ 127,859
Total cost of revenue	34,497	32,885
Gross profit	96,966	94,974
Operating expenses:
Research and development	31,467	27,516
Sales and marketing	28,099	26,451
General and administrative	22,346	20,329
Amortization of intangible assets	3,840	3,528
Other operating income, net	(891)	(617)
Total operating expenses	84,861	77,207
Operating income	12,105	17,767
Interest expense	2,813	270
Other (income) expense, net	(1,390)	390
Income before income taxes	10,682	17,107
Income tax expense	4,652	4,088
Net income	$ 6,030	$ 13,019
Income per share:
Net income per share attributable to common stockholders, basic	$ 0.08	$ 0.18
Net income per share attributable to common stockholders, diluted	$ 0.08	$ 0.17
Weighted average shares outstanding:
Weighted average number of shares used in computing net income per share, basic	72,623	70,786
Weighted average number of shares used in computing net income per share, diluted	77,004	76,720
License [Member]
Total revenue	$ 77,543	$ 76,621
Total cost of revenue	5,523	5,821
Maintenance and Other Services [Member]
Total revenue	30,900	26,670
Total cost of revenue	10,455	8,531
Total Software [Member]
Total revenue	108,443	103,291
Total cost of revenue	15,978	14,352
Software Related Services [Member]
Total revenue	6,934	9,772
Total cost of revenue	5,489	6,518
Total Software and Related Services [Member]
Total revenue	115,377	113,063
Total cost of revenue	21,467	20,870
Client Engineering Services [Member]
Total revenue	13,878	12,050
Total cost of revenue	11,318	9,800
Other [Member]
Total revenue	2,208	2,746
Total cost of revenue	$ 1,712	$ 2,215