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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement [Abstract] |  |  |  |
Revenue | $ 56,419 | $ 34,582 | $ 141,137 | $ 102,865
Costs and expenses: |  |  |  |
FI Share and other third-party costs | 32,470 | 17,982 | 79,094 | 59,149
Delivery costs | 3,070 | 3,007 | 9,686 | 7,509
Sales and marketing expense | 11,074 | 9,452 | 31,458 | 27,915
Research and development expense | 3,018 | 4,097 | 8,741 | 12,444
General and administration expense | 12,218 | 7,925 | 27,558 | 23,486
Depreciation and amortization expense | 1,167 | 777 | 3,181 | 2,471
Total costs and expenses | 63,017 | 43,240 | 159,718 | 132,974
Operating loss | (6,598) | (8,658) | (18,581) | (30,109)
Other income (expense): |  |  |  |
Interest expense, net | (218) | (254) | (860) | (2,995)
Change in fair value of warrant liabilities, net | 0 | 801 | 0 | (6,760)
Other expense | (931) | (257) | (1,130) | (1,612)
Total other income (expense) | (1,149) | 290 | (1,990) | (11,367)
Loss before income taxes | (7,747) | (8,368) | (20,571) | (41,476)
Net loss | (7,747) | (8,368) | (20,571) | (41,476)
Adjustments to the carrying value of preferred stock | 0 | 0 | 0 | (157)
Net loss attributable to common stockholders | $ (7,747) | $ (8,368) | $ (20,571) | $ (41,633)
Net loss per share attributable to common stockholders, basic and diluted (in USD per share) | $ (0.33) | $ (0.40) | $ (0.90) | $ (2.29)
Weighted-average common shares outstanding, basic and diluted (in shares) | 23,561 | 20,970 | 22,936 | 18,150

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