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Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Total revenue | $ 10,765 | $ 8,925 | $ 25,618 | $ 16,805
Cost of sales | 6,229 | 3,133 | 11,127 | 6,796
Gross profit | 4,536 | 5,792 | 14,491 | 10,009
Operating expenses: |  |  |  |
Research and development | 6,773 | 6,427 | 13,253 | 12,816
General and administrative | 3,329 | 2,793 | 6,548 | 5,638
Sales and marketing | 1,713 | 1,361 | 3,079 | 2,219
Total operating expenses | 11,815 | 10,581 | 22,880 | 20,673
Loss from operations | (7,279) | (4,789) | (8,389) | (10,664)
Interest expense | (222) | (176) | (433) | (406)
Other income, net | 132 | 24 | 176 | 43
Loss on extinguishment of debt |  | (246) |  | (246)
Net loss and comprehensive loss | $ (7,369) | $ (5,187) | $ (8,646) | $ (11,273)
Net loss per common share, basic and diluted | $ (0.44) | $ (0.42) | $ (0.55) | $ (0.91)
Weighted-average shares used to compute net loss per common share, basic and diluted | 16,635,261 | 12,413,524 | 15,717,248 | 12,357,066
Product sales |  |  |  |
Total revenue | $ 9,449 | $ 7,200 | $ 18,814 | $ 13,848
Licensing, royalty and other revenue |  |  |  |
Total revenue | $ 1,316 | $ 1,725 | $ 6,804 | $ 2,957

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