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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenue:    
Products $ 39,706 $ 36,374
Services 20,580 17,430
Total revenue 60,286 53,804
Cost of revenue:    
Products 9,784 8,698
Services 4,360 4,529
Total cost of revenue 14,144 13,227
Gross profit 46,142 40,577
Operating expenses:    
Sales and marketing 26,263 26,768
Research and development 17,042 14,777
General and administrative 7,161 6,661
Litigation and settlement expense 0 1,791
Total operating expenses 50,466 49,997
Loss from operations (4,324) (9,420)
Other income (expense), net:    
Interest expense (44) (126)
Interest and other income (expense), net 842 215
Total other income (expense), net 798 89
Loss before income taxes (3,526) (9,331)
Provision for income taxes 374 204
Net loss $ (3,900) $ (9,535)
Net loss per share:    
Basic and diluted (in dollars per share) $ (0.06) $ (0.15)
Weighted-average shares used in computing net loss per share:    
Basic and diluted (in shares) 68,571 64,309