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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue:        
Total revenue $ 30,610 $ 17,077 $ 59,607 $ 32,675
Cost of revenue:        
Total cost of revenue 16,857 10,464 32,877 18,574
Gross profit 13,753 6,613 26,730 14,101
Operating expense:        
Research and development 22,266 15,010 42,815 30,260
Sales, general and administrative 29,060 15,127 55,198 40,074
Total operating expense 51,326 30,137 98,013 70,334
Operating loss (37,573) (23,524) (71,283) (56,233)
Gain (loss) from Continuation Advances     (52,000) 34,000
Interest expense (3,589)   (5,378) (267)
Other income, net 161 438 225 676
Net loss (41,001) (23,086) (128,436) (21,824)
Other comprehensive income (loss):        
Unrealized income (loss) on investments (80) 213 (91) 238
Comprehensive loss $ (41,081) $ (22,873) $ (128,527) $ (21,586)
Net loss per share:        
Basic $ (0.21) $ (0.15) $ (0.65) $ (0.14)
Diluted $ (0.21) $ (0.15) $ (0.65) $ (0.14)
Weighted average shares outstanding used in computing net loss per share        
Basic 198,568 154,172 196,690 153,229
Diluted 198,568 154,172 196,690 153,229
Product [Member]        
Revenue:        
Total revenue $ 26,533 $ 13,756 $ 51,836 $ 26,049
Cost of revenue:        
Total cost of revenue 13,222 8,225 25,919 13,646
Service and Other [Member]        
Revenue:        
Total revenue 4,077 3,321 7,771 6,626
Cost of revenue:        
Total cost of revenue $ 3,635 $ 2,239 $ 6,958 $ 4,928