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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue:        
Revenue $ 21,578 $ 20,073 $ 40,940 $ 44,988
Cost of revenue:        
Cost of revenue 12,716 12,072 24,782 28,050
Gross profit 8,862 8,001 16,158 16,938
Operating expense:        
Research and development 15,664 16,883 31,975 33,854
Sales, general and administrative 14,943 15,505 29,877 30,770
Total operating expense 30,607 32,388 61,852 64,624
Operating loss (21,745) (24,387) (45,694) (47,686)
Interest expense (598) (826) (1,179) (1,664)
Other income (expense), net (197) (326) 154 (56)
Net loss (22,540) (25,539) (46,719) (49,406)
Other comprehensive loss:        
Unrealized income (loss) on investments 22 (13) 16 (21)
Comprehensive loss $ (22,518) $ (25,552) $ (46,703) $ (49,427)
Net loss per share:        
Basic and diluted net loss per share $ (0.17) $ (0.26) $ (0.37) $ (0.52)
Shares used in computing basic and diluted net loss per share 131,882 97,360 127,847 95,177
Product [Member]        
Revenue:        
Revenue $ 18,485 $ 16,548 $ 34,767 $ 37,842
Cost of revenue:        
Cost of revenue 9,858 8,155 18,877 19,517
Service and Other [Member]        
Revenue:        
Revenue 3,093 3,525 6,173 7,146
Cost of revenue:        
Cost of revenue $ 2,858 $ 3,917 $ 5,905 $ 8,533