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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Consolidated Statements of Operations |  |  |
Revenues | $ 106,712 | $ 83,937 | $ 60,426
Cost of goods sold | 17,349 | 12,923 | 9,311
Gross profit | 89,363 | 71,014 | 51,115
Costs and expenses: |  |  |
Sales and marketing | 71,950 | 56,617 | 37,636
Research and development | 17,514 | 11,773 | 6,699
General and administrative | 31,305 | 23,124 | 14,731
Total costs and expenses | 120,769 | 91,514 | 59,066
Loss from operations | (31,406) | (20,500) | (7,951)
Other income (expense): |  |  |
Investment income | 2,364 | 1,525 |
Interest expense | (40) | (1,127) | (2,217)
Interest expense - deferred financing costs |  | (81) | (246)
Loss on extinguishment of debt |  | (2,186) |
Other expense | (53) | (28) | (31)
Total other income (expense), net | 2,271 | (1,897) | (2,494)
Net Loss | $ (29,135) | $ (22,397) | $ (10,445)
Weighted average common shares outstanding - basic and diluted | 39,235 | 37,127 | 33,323
Loss per common share - basic and diluted | $ (0.74) | $ (0.60) | $ (0.31)

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