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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue:        
Revenue $ 18,160 $ 23,545 $ 59,100 $ 68,533
Cost of revenue:        
Cost of revenue 14,968 15,318 39,750 43,368
Gross profit 3,192 8,227 19,350 25,165
Operating expense:        
Research and development 14,356 15,844 46,331 49,698
Sales, general and administrative 13,506 13,952 43,383 44,722
Total operating expense 27,862 29,796 89,714 94,420
Operating loss (24,670) (21,569) (70,364) (69,255)
Interest expense (616) (633) (1,795) (2,297)
Other income, net 242 181 396 125
Net loss (25,044) (22,021) (71,763) (71,427)
Other comprehensive loss:        
Unrealized income (loss) on investments (8) 14 8 (7)
Comprehensive loss $ (25,052) $ (22,007) $ (71,755) $ (71,434)
Net loss per share:        
Basic and diluted net loss per share $ (0.19) $ (0.19) $ (0.55) $ (0.70)
Shares used in computing basic and diluted net loss per share 135,130 115,771 130,302 102,117
Product [Member]        
Revenue:        
Revenue $ 15,150 $ 20,343 $ 49,917 $ 58,185
Cost of revenue:        
Cost of revenue 12,250 11,547 31,127 31,064
Service and Other [Member]        
Revenue:        
Revenue 3,010 3,202 9,183 10,348
Cost of revenue:        
Cost of revenue $ 2,718 $ 3,771 $ 8,623 $ 12,304