Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total revenue	$ 121,307	$ 106,456	$ 391,382	$ 336,480
Total cost of revenue	31,501	29,036	96,869	88,614
Gross profit	89,806	77,420	294,513	247,866
Operating expenses:
Research and development	35,839	30,678	112,872	91,115
Sales and marketing	30,589	26,998	94,568	80,903
General and administrative	22,196	20,905	67,983	63,499
Amortization of intangible assets	4,432	3,858	13,924	11,390
Other operating income, net	(1,324)	(1,596)	(2,526)	(3,431)
Total operating expenses	91,732	80,843	286,821	243,476
Operating (loss) income	(1,926)	(3,423)	7,692	4,390
Interest expense	3,037	2,934	8,998	8,590
Other expense (income), net	124	(782)	1,667	(1,852)
Loss before income taxes	(5,087)	(5,575)	(2,973)	(2,348)
Income tax expense	3,022	2,930	4,424	10,350
Net loss	$ (8,109)	$ (8,505)	$ (7,397)	$ (12,698)
Loss per share:
Net loss per share attributable to common stockholders, basic	$ (0.11)	$ (0.12)	$ (0.10)	$ (0.17)
Net loss per share attributable to common stockholders, diluted	$ (0.11)	$ (0.12)	$ (0.10)	$ (0.17)
Weighted average shares outstanding:
Weighted average number of shares used in computing net loss per share, basic	75,750	73,311	75,226	72,979
Weighted average number of shares used in computing net loss per share, diluted	75,750	73,311	75,226	72,979
License [Member]
Total revenue	$ 67,603	$ 55,023	$ 230,630	$ 183,584
Total cost of revenue	4,694	4,477	13,706	12,851
Maintenance and Other Services [Member]
Total revenue	34,686	32,787	100,758	94,502
Total cost of revenue	11,770	9,626	35,368	28,583
Total Software [Member]
Total revenue	102,289	87,810	331,388	278,086
Total cost of revenue	16,464	14,103	49,074	41,434
Software Related Services [Member]
Total revenue	7,650	6,170	23,229	18,548
Total cost of revenue	5,707	4,996	17,560	15,141
Total Software and Related Services [Member]
Total revenue	109,939	93,980	354,617	296,634
Total cost of revenue	22,171	19,099	66,634	56,575
Client Engineering Services [Member]
Total revenue	10,060	10,868	31,005	34,386
Total cost of revenue	7,982	8,510	25,163	27,617
Other [Member]
Total revenue	1,308	1,608	5,760	5,460
Total cost of revenue	$ 1,348	$ 1,427	$ 5,072	$ 4,422