Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net revenue:
Total net revenue	$ 84,800,000	$ 74,435,000	$ 169,044,000	$ 146,743,000
Cost of revenue:
Total cost of revenue	17,434,000	15,574,000	36,275,000	30,526,000
Gross profit	67,366,000	58,861,000	132,769,000	116,217,000
Operating expenses:
Research and development	18,445,000	14,528,000	37,601,000	31,978,000
Sales and marketing	40,516,000	36,388,000	80,047,000	73,512,000
General and administrative	12,646,000	12,375,000	27,917,000	25,911,000
Restructuring charges	0	0	2,551,000	667,000
Amortization of intangible assets	132,000	132,000	264,000	449,000
Total operating expenses	71,739,000	63,423,000	148,380,000	132,517,000
Loss from operations	(4,373,000)	(4,562,000)	(15,611,000)	(16,300,000)
Gain on sale of business		0		35,871,000
Other income, net	972,000	158,000	1,949,000	66,000
(Loss) income before provision for income taxes	(3,401,000)	(4,404,000)	(13,662,000)	19,637,000
Income tax expense (benefit)	19,658,000	(914,000)	19,178,000	44,000
Net (loss) income	$ (23,059,000)	$ (3,490,000)	$ (32,840,000)	$ 19,593,000
Earnings per share:
Basic	$ (0.66)	$ (0.10)	$ (0.95)	$ 0.59
Diluted	$ (0.66)	$ (0.10)	$ (0.95)	$ 0.58
Shares used in computing earnings per share:
Basic	34,833	33,640	34,638	33,425
Diluted	34,833	33,640	34,638	33,984
Products and License [Member]
Net revenue:
Total net revenue	$ 19,218,000	$ 20,012,000	$ 39,730,000	$ 39,590,000
Cost of revenue:
Total cost of revenue	1,364,000	1,823,000	3,638,000	3,755,000
Services [Member]
Net revenue:
Total net revenue	65,582,000	54,423,000	129,314,000	107,153,000
Cost of revenue:
Total cost of revenue	$ 16,070,000	$ 13,751,000	$ 32,637,000	$ 26,771,000