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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue:    
Revenue $ 16,425 $ 19,362
Cost of Revenue:    
Cost of revenue 11,308 12,066
Gross profit 5,117 7,296
Operating expense:    
Research and development 15,485 16,311
Sales, general and administrative 19,766 14,934
Total operating expense 35,251 31,245
Operating loss (30,134) (23,949)
Interest expense (625) (581)
Other income, net 435 351
Net loss (30,324) (24,179)
Other comprehensive income (loss):    
Unrealized income (loss) on investments 42 (6)
Comprehensive loss $ (30,282) $ (24,185)
Net loss per share:    
Basic and diluted net loss per share $ (0.20) $ (0.20)
Shares used in computing basic and diluted net loss per share 151,274 123,768
Product [Member]    
Revenue:    
Revenue $ 13,457 $ 16,282
Cost of Revenue:    
Cost of revenue 8,618 9,019
Service and Other [Member]    
Revenue:    
Revenue 2,968 3,080
Cost of Revenue:    
Cost of revenue $ 2,690 $ 3,047