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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenue:        
Products $ 34,990 $ 31,601 $ 98,837 $ 102,140
Services 15,788 11,827 43,494 32,165
Total revenue 50,778 43,428 142,331 134,305
Cost of revenue:        
Products 8,529 8,818 23,501 23,655
Services 4,186 2,935 11,601 8,491
Total cost of revenue 12,715 11,753 35,102 32,146
Gross profit 38,063 31,675 107,229 102,159
Operating expenses:        
Sales and marketing 25,774 24,651 75,258 70,189
Research and development 13,562 12,342 41,542 35,416
General and administrative 6,892 5,141 20,122 16,035
Litigation expense (benefit) 469 910 1,939 (3,103)
Total operating expenses 46,697 43,044 138,861 118,537
Loss from operations (8,634) (11,369) (31,632) (16,378)
Other income (expense), net:        
Interest expense (151) (192) (382) (904)
Interest income and other income (expense), net 22 (510) (167) (673)
Total other income (expense), net (129) (702) (549) (1,577)
Loss before provision for income taxes (8,763) (12,071) (32,181) (17,955)
Provision for income taxes 204 233 497 747
Net loss (8,967) (12,304) (32,678) (18,702)
Accretion of redeemable convertible preferred stock dividend 0 0 0 (1,150)
Net loss attributable to common stockholders $ (8,967) $ (12,304) $ (32,678) $ (19,852)
Earnings Per Share, Basic and Diluted $ (0.14) $ (0.21) $ (0.53) $ (0.45)
Weighted Average Number of Shares Outstanding, Basic and Diluted 62,753 59,913 62,009 44,538