Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Product	$ 46,526	$ 43,512
Professional services	4,135	3,614
Total revenues	50,661	47,126
Cost of revenues:
Product	12,766	11,633
Professional services	5,669	5,593
Total cost of revenues	18,435	17,226
Gross profit	32,226	29,900
Operating expenses:
Research and development	11,739	13,973
Sales and marketing	20,981	18,865
General and administrative	6,447	6,499
Total operating expenses	39,167	39,337
Loss from operations	(6,941)	(9,437)
Other income (expense), net:
Interest income	116	53
Interest expense	(44)	(79)
Other, net	(203)	1,501
Total other income (expense), net	(131)	1,475
Loss before provision for income taxes	(7,072)	(7,962)
Provision for income taxes	337	203
Net loss	$ (7,409)	$ (8,165)
Basic and diluted net loss per share (usd per share)	$ (0.10)	$ (0.11)
Shares used in basic and diluted per share calculations (shares)	76,488	74,107