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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
Consolidated Statements of Operations and Comprehensive Loss [Abstract]      
Revenue $ 174,716 $ 155,109 $ 129,755
Cost of revenue 48,553 44,008 36,880
Gross profit 126,163 111,101 92,875
Operating expenses:      
Research and development expenses 34,144 35,824 25,742
Selling, general and administrative expenses 116,998 106,415 93,853
Total operating expenses 151,142 142,239 119,595
Loss from operations (24,979) (31,138) (26,720)
Other income (expense):      
Interest expense (2,264) (1,801) (292)
Interest income 227 227 190
Other 138 (586) (354)
Loss before income tax expense (26,878) (33,298) (27,176)
Income tax expense 14 40 36
Net loss $ (26,892) $ (33,338) $ (27,212)
Basic and diluted net loss per share $ (0.83) $ (1.05) $ (0.97)
Weighted average shares outstanding — basic and diluted 32,387 31,609 28,058
Comprehensive loss:      
Unrealized gain on investments $ 15 $ 18 $ 15
Foreign currency translation adjustment 487 125 (278)
Other comprehensive income (loss) 502 143 (263)
Net loss (26,892) (33,338) (27,212)
Comprehensive loss, net of tax $ (26,390) $ (33,195) $ (27,475)