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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Statement [Abstract] |  |  |  |
Revenue | $ 16,317 | $ 13,663 | $ 31,308 | $ 26,375
Cost of goods sold | 1,588 | 1,182 | 3,114 | 2,230
Gross profit | 14,729 | 12,481 | 28,194 | 24,145
Operating expenses: |  |  |  |
Sales and marketing | 16,727 | 10,318 | 32,542 | 21,285
Research and development | 1,946 | 1,296 | 3,629 | 2,502
General and administrative | 4,194 | 2,564 | 8,960 | 4,972
Total operating expenses | 22,867 | 14,178 | 45,131 | 28,759
Loss from operations | (8,138) | (1,697) | (16,937) | (4,614)
Interest and other income (expense), net: |  |  |  |
Interest income | 695 | 68 | 1,439 | 130
Interest expense | (1,233) | (1,269) | (2,463) | (2,544)
Other expense, net | 22 | (249) | (38) | (320)
Net loss | (8,654) | (3,147) | (17,999) | (7,348)
Other comprehensive income (loss): |  |  |  |
Changes in foreign currency translation | 12 | 54 | (7) | 33
Unrealized gain on marketable securities | 59 | 0 | 84 | 0
Comprehensive loss | $ (8,583) | $ (3,093) | $ (17,922) | $ (7,315)
Net loss per share, basic and diluted (in dollars per share) | $ (0.35) | $ (0.87) | $ (0.74) | $ (2.04)
Weighted-average number of common shares used to compute basic and diluted net loss per share (in shares) | 24,577,938 | 3,608,283 | 24,484,608 | 3,603,308

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