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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue:      
Revenue $ 78,626 $ 93,468 $ 90,714
Cost of Revenue:      
Cost of revenue 53,530 58,809 46,554
Gross profit 25,096 34,659 44,160
Operating Expense:      
Research and development 62,594 65,324 67,617
Sales, general and administrative 63,489 59,119 47,787
Total operating expense 126,083 124,443 115,404
Operating loss (100,987) (89,784) (71,244)
Interest expense (2,423) (2,921) (3,234)
Other income, net 848 516 103
Net loss (102,562) (92,189) (74,375)
Other comprehensive loss:      
Unrealized gain (loss) on investments (4) (37) 12
Comprehensive loss $ (102,566) $ (92,226) $ (74,363)
Net loss per share:      
Basic and diluted net loss per share $ (0.76) $ (0.87) $ (0.83)
Shares used in computing basic and diluted net loss per share 135,094 105,682 89,148
Product [Member]      
Revenue:      
Revenue $ 66,355 $ 80,030 $ 64,609
Cost of Revenue:      
Cost of revenue 42,053 42,900 34,512
Service and Other [Member]      
Revenue:      
Revenue 12,271 13,438 13,971
Cost of Revenue:      
Cost of revenue $ 11,477 $ 15,909 12,042
Contractual [Member]      
Revenue:      
Revenue     $ 12,134