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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenue $ 200,225 $ 162,090 $ 128,868
Cost of revenue 83,104 66,934 59,495
Gross profit 117,121 95,156 69,373
Operating expenses:      
Research and development 27,120 23,878 22,659
Sales and marketing 66,570 52,748 42,042
General and administrative 29,151 25,072 25,822
Total operating expenses 122,841 101,698 90,523
Loss from operations (5,720) (6,542) (21,150)
Other income (expense), net:      
Extinguishment of debt 0 (1,026) 0
Interest expense (3,471) (4,226) (4,727)
Interest income and other 490 (12) 100
Total other income (expense), net (2,981) (5,264) (4,627)
Loss before income taxes (8,701) (11,806) (25,777)
Provision for income taxes 268 54 61
Net loss $ (8,969) $ (11,860) $ (25,838)
Net loss per share:      
Basic and diluted (in USD per share) $ (0.16) $ (0.23) $ (0.52)
Shares used in computing net loss per share:      
Basic and diluted (in shares) 54,946 52,342 50,141
Comprehensive Loss:      
Comprehensive loss $ (8,969) $ (11,860) $ (25,838)