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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue:    
Total revenue $ 28,997 $ 15,598
Cost of revenue:    
Total cost of revenue 16,020 8,110
Gross profit 12,977 7,488
Operating expense:    
Research and development 20,548 15,250
Sales, general and administrative 26,139 24,947
Total operating expense 46,687 40,197
Operating loss (33,710) (32,709)
Gain (loss) from Continuation Advances (52,000) 34,000
Interest expense (1,789) (267)
Other income, net 64 238
Net income (loss) (87,435) 1,262
Other comprehensive income:    
Unrealized income (loss) on investments (11) 25
Comprehensive income (loss) $ (87,446) $ 1,287
Net income (loss) per share:    
Basic $ (0.45) $ 0.01
Diluted $ (0.45) $ 0.01
Weighted average shares outstanding used in computing net income (loss) per share    
Basic 194,790 153,453
Diluted 194,790 155,855
Product [Member]    
Revenue:    
Total revenue $ 25,303 $ 12,293
Cost of revenue:    
Total cost of revenue 12,697 5,421
Service and Other [Member]    
Revenue:    
Total revenue 3,694 3,305
Cost of revenue:    
Total cost of revenue $ 3,323 $ 2,689