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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cost of revenue $ 11,095 $ 8,320
Gross profit 12,284 10,291
Operating expenses:    
Research and development 15,748 15,810
Selling, general and administrative 19,170 15,913
Total operating expenses 34,918 31,723
Loss from operations (16,447) (15,402)
Non-operating expense, net:    
Foreign exchange loss (396) (223)
Interest expense (972) (935)
Other income, net 456 151
Total non-operating expense, net (912) (1,007)
Loss before income taxes (17,359) (16,409)
Provision for income taxes 98 57
Net loss $ (17,457) $ (16,466)
Net loss per share:    
Basic and diluted $ (0.10) $ (0.10)
Weighted average shares used for calculating net loss per share:    
Basic and diluted 168,824 157,405
Product    
Revenue $ 23,379 $ 18,611
Government Contract    
Revenue $ 6,187 $ 6,030