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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Cost of revenue | $ 7,583 | $ 8,142 | $ 24,126 | $ 23,192
Gross profit | 10,436 | 7,257 | 29,606 | 21,191
Operating expenses: |  |  |  |
Research and development | 16,081 | 10,825 | 43,938 | 30,143
Selling, general and administrative | 16,140 | 13,964 | 49,041 | 42,008
Total operating expenses | 32,221 | 24,789 | 92,979 | 72,151
Loss from operations | (16,958) | (13,604) | (49,819) | (39,530)
Non-operating expense, net: |  |  |  |
Foreign exchange (loss) gain | (254) | 8 | (311) | (22)
Interest expense | (1,031) | (1,053) | (5,105) | (2,926)
Other income, net | 336 | 513 | 1,095 | 1,288
Total non-operating expense, net | (949) | (532) | (4,321) | (1,660)
Loss before income taxes | (17,907) | (14,136) | (54,140) | (41,190)
Provision for income taxes | 60 | 56 | 181 | 169
Net loss | $ (17,967) | $ (14,192) | $ (54,321) | $ (41,359)
Net loss per share: |  |  |  |
Basic and diluted | $ (0.13) | $ (0.11) | $ (0.39) | $ (0.32)
Weighted average shares used for calculating net loss per share: |  |  |  |
Basic and diluted | 140,908 | 134,326 | 138,779 | 130,199
Product |  |  |  |
Revenue | $ 18,019 | $ 15,399 | $ 53,732 | $ 44,383
Government Contract |  |  |  |
Revenue | $ 4,827 | $ 3,928 | $ 13,554 | $ 11,430

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