Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Total revenue	$ 119,912	$ 98,561	$ 270,075	$ 230,024
Total cost of revenue	31,946	25,081	65,368	59,578
Gross profit	87,966	73,480	204,707	170,446
Operating expenses:
Research and development	38,757	28,970	77,033	60,437
Sales and marketing	31,909	25,806	63,979	53,905
General and administrative	21,861	20,248	45,787	42,594
Amortization of intangible assets	4,615	3,692	9,492	7,532
Other operating income, net	(585)	(944)	(1,202)	(1,835)
Total operating expenses	96,557	77,772	195,089	162,633
Operating (loss) income	(8,591)	(4,292)	9,618	7,813
Interest expense	2,988	2,843	5,961	5,656
Other expense (income), net	708	320	1,543	(1,070)
(Loss) income before income taxes	(12,287)	(7,455)	2,114	3,227
Income tax expense	1,361	2,768	1,402	7,420
Net (loss) income	$ (13,648)	$ (10,223)	$ 712	$ (4,193)
(Loss) income per share:
Net (loss) income per share attributable to common stockholders, basic	$ (0.18)	$ (0.14)	$ 0.01	$ (0.06)
Net (loss) imcome per share attributable to common stockholders, diluted	$ (0.18)	$ (0.14)	$ 0.01	$ (0.06)
Weighted average shares outstanding:
Weighted average number of shares used in computing net (loss) income per share, basic	75,263	72,999	74,959	72,811
Weighted average number of shares used in computing net (loss) income per share, diluted	75,263	72,999	79,851	72,811
License [Member]
Total revenue	$ 66,632	$ 51,018	$ 163,027	$ 128,561
Total cost of revenue	3,617	2,851	9,012	8,374
Maintenance and Other Services [Member]
Total revenue	32,926	30,815	66,072	61,715
Total cost of revenue	12,043	8,502	23,598	18,957
Total Software [Member]
Total revenue	99,558	81,833	229,099	190,276
Total cost of revenue	15,660	11,353	32,610	27,331
Software Related Services [Member]
Total revenue	7,481	5,444	15,579	12,378
Total cost of revenue	5,731	4,656	11,853	10,145
Total Software and Related Services [Member]
Total revenue	107,039	87,277	244,678	202,654
Total cost of revenue	21,391	16,009	44,463	37,476
Client Engineering Services [Member]
Total revenue	10,268	9,640	20,945	23,518
Total cost of revenue	8,293	7,789	17,181	19,107
Other [Member]
Total revenue	2,605	1,644	4,452	3,852
Total cost of revenue	$ 2,262	$ 1,283	$ 3,724	$ 2,995