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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue:        
Product revenue $ 16,548 $ 13,587 $ 37,842 $ 25,966
Service and other revenue 3,525 3,564 7,146 6,716
Contractual revenue   3,596   7,192
Total revenue 20,073 20,747 44,988 39,874
Cost of Revenue:        
Cost of product revenue 8,155 7,115 19,517 13,995
Cost of service and other revenue 3,917 2,988 8,533 5,731
Total cost of revenue 12,072 10,103 28,050 19,726
Gross profit 8,001 10,644 16,938 20,148
Operating expense:        
Research and development 16,883 17,522 33,854 33,883
Sales, general and administrative 15,505 11,192 30,770 22,900
Total operating expense 32,388 28,714 64,624 56,783
Operating loss (24,387) (18,070) (47,686) (36,635)
Interest expense (826) (795) (1,664) (1,574)
Other income (expense), net (326) 366 (56) 358
Net loss (25,539) (18,499) (49,406) (37,851)
Other comprehensive loss:        
Unrealized gain on investments (13) 11 (21) 59
Comprehensive loss $ (25,552) $ (18,488) $ (49,427) $ (37,792)
Net loss per share:        
Basic and diluted net loss per share $ (0.26) $ (0.21) $ (0.52) $ (0.44)
Shares used in computing basic and diluted net loss per share 97,360 88,148 95,177 85,876