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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue:        
Total revenue $ 19,082 $ 21,915 $ 51,757 $ 62,961
Cost of revenue:        
Total cost of revenue 12,018 15,001 30,592 41,317
Gross profit 7,064 6,914 21,165 21,644
Operating expense:        
Research and development 16,467 14,962 46,727 45,357
Sales, general and administrative 14,772 20,066 54,846 58,915
Total operating expense 31,239 35,028 101,573 104,272
Operating loss (24,175) (28,114) (80,408) (82,628)
Gain from Continuation Advances     34,000  
Interest expense   (664) (267) (1,933)
Other income (expense), net 467 (345) 1,143 518
Net loss (23,708) (29,123) (45,532) (84,043)
Other comprehensive income (loss):        
Unrealized income (loss) on investments (125) (6) 113 47
Comprehensive loss $ (23,833) $ (29,129) $ (45,419) $ (83,996)
Net loss per share:        
Basic and diluted net loss per share $ (0.14) $ (0.19) $ (0.29) $ (0.55)
Shares used in computing basic and diluted net loss per share 166,862 152,983 158,195 152,351
Product [Member]        
Revenue:        
Total revenue $ 15,749 $ 18,484 $ 41,798 $ 53,191
Cost of revenue:        
Total cost of revenue 9,228 12,188 22,874 32,786
Service and Other [Member]        
Revenue:        
Total revenue 3,333 3,431 9,959 9,770
Cost of revenue:        
Total cost of revenue $ 2,790 $ 2,813 $ 7,718 $ 8,531