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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement [Abstract] |  |  |  |
Revenue | $ 13,381 | $ 11,683 | $ 39,756 | $ 34,214
Cost of goods sold | 1,221 | 1,328 | 3,451 | 3,894
Gross profit | 12,160 | 10,355 | 36,305 | 30,320
Operating expenses: |  |  |  |
Sales and marketing | 10,605 | 9,857 | 31,890 | 30,987
Research and development | 1,373 | 1,466 | 3,875 | 4,234
General and administrative | 3,226 | 4,071 | 8,198 | 10,808
Total operating expenses | 15,204 | 15,394 | 43,963 | 46,029
Loss from operations | (3,044) | (5,039) | (7,658) | (15,709)
Interest and other income (expense), net: |  |  |  |
Interest income | 69 | 44 | 199 | 117
Interest expense | (1,282) | (1,005) | (3,826) | (2,925)
Other income (expense), net | (535) | 317 | (855) | 383
Net loss | (4,792) | (5,683) | (12,140) | (18,134)
Other comprehensive income: |  |  |  |
Changes in foreign currency translation | (4) | (25) | 29 | (60)
Comprehensive loss | $ (4,796) | $ (5,708) | $ (12,111) | $ (18,194)
Net loss per share, basic and diluted (in dollars per share) | $ (1.29) | $ (1.64) | $ (3.34) | $ (5.26)
Weighted-average number of common shares used to compute basic and diluted net loss per share (in shares) | 3,712,876 | 3,475,628 | 3,638,905 | 3,450,252

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