Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Product	$ 46,545	$ 44,156	$ 93,071	$ 87,668
Professional services	4,472	4,455	8,607	8,069
Total revenues	51,017	48,611	101,678	95,737
Cost of revenues:
Product	12,249	12,374	25,015	24,007
Professional services	5,095	5,777	10,764	11,370
Total cost of revenues	17,344	18,151	35,779	35,377
Gross profit	33,673	30,460	65,899	60,360
Operating expenses:
Research and development	11,836	13,577	23,575	27,550
Sales and marketing	18,120	18,959	39,101	37,824
General and administrative	6,429	6,780	12,876	13,279
Restructuring	4,113	0	4,113	0
Total operating expenses	40,498	39,316	79,665	78,653
Loss from operations	(6,825)	(8,856)	(13,766)	(18,293)
Other income (expense), net:
Interest income	136	67	252	120
Interest expense	(37)	(43)	(81)	(122)
Other, net	446	(464)	243	1,037
Total other income (expense), net	545	(440)	414	1,035
Loss before provision for income taxes	(6,280)	(9,296)	(13,352)	(17,258)
Provision for income taxes	445	14	782	217
Net loss	$ (6,725)	$ (9,310)	$ (14,134)	$ (17,475)
Basic and diluted net loss per share (usd per share)	$ (0.09)	$ (0.12)	$ (0.18)	$ (0.23)
Shares used in basic and diluted per share calculations (shares)	77,144	75,011	76,813	74,528