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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Statement [Abstract] |  |  |  |
Product revenue | $ 9,525 | $ 9,251 | $ 16,531 | $ 16,883
Cost of product revenue | 4,360 | 4,976 | 8,054 | 9,239
Gross profit on product revenue | 5,165 | 4,275 | 8,477 | 7,644
Government contracts revenue | 1,667 |  | 3,095 |
Operating expenses: |  |  |  |
Research and development | 8,891 | 8,557 | 18,041 | 15,474
Selling, general and administrative | 14,094 | 12,406 | 27,727 | 24,153
Amortization of intangible assets | 51 | 51 | 101 | 101
Total operating expenses | 23,036 | 21,014 | 45,869 | 39,728
Loss from operations | (16,204) | (16,739) | (34,297) | (32,084)
Non-operating income (expense), net: |  |  |  |
Foreign exchange (loss) gain | (14) | 101 | (59) | (16)
Interest expense | (501) | (658) | (1,032) | (1,313)
Other income, net | 3,512 | 113 | 3,618 | 179
Total non-operating income (expense), net | 2,997 | (444) | 2,527 | (1,150)
Loss before income taxes | (13,207) | (17,183) | (31,770) | (33,234)
Provision for income taxes | 3,876 | 983 | 3,911 | 1,795
Net loss | $ (17,083) | $ (18,166) | $ (35,681) | $ (35,029)
Net loss per share: |  |  |  |
Basic | $ (0.16) | $ (0.18) | $ (0.34) | $ (0.35)
Diluted | $ (0.16) | $ (0.18) | $ (0.34) | $ (0.35)
Weighted average shares outstanding used for calculating net loss per share: |  |  |  |
Basic | 105,044 | 101,563 | 104,308 | 100,517
Diluted | 105,044 | 101,563 | 104,308 | 100,517

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