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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenues: |  |  |  |
Royalties | $ 136,401 | $ 51,687 | $ 246,738 | $ 150,560
Services | 0 | 0 | 0 | 1,495
Total revenues | 136,401 | 51,687 | 246,738 | 152,055
Costs and expenses: |  |  |  |
Research and development | 2,854,812 | 2,818,824 | 8,036,225 | 8,297,763
Selling, general and administrative | 1,644,211 | 1,440,339 | 4,799,457 | 4,243,490
Total operating expenses | 4,499,023 | 4,259,163 | 12,835,682 | 12,541,253
Loss from operations | (4,362,622) | (4,207,476) | (12,588,944) | (12,389,198)
Interest income | 15,864 | 53,700 | 67,358 | 188,204
Gain (loss) from change in fair value of derivative financial instruments—warrants | (144,035) | 13,330 | (186,072) | 27,359
Other income (expense), net | (5,738) | (1,103) | (1,967) | 2,012
Net loss | (4,496,531) | (4,141,549) | (12,709,625) | (12,171,623)
Preferred stock dividend payable on Series A Convertible Preferred Stock | (6,060) | (6,060) | (18,180) | (18,180)
Net loss attributable to common stockholders | $ (4,502,591) | $ (4,147,609) | $ (15,994,289) | $ (12,458,072)
Net loss per common share - basic and diluted (in dollars per share) | $ (0.19) | $ (0.69) | $ (1.00) | $ (2.40)
Weighted-average shares outstanding - basic and diluted (in shares) | 23,341,218 | 6,024,679 | 15,941,665 | 5,180,221
Series C Convertible Preferred Stock |  |  |  |
Costs and expenses: |  |  |  |
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance | $ 0 | $ 0 | $ 0 | $ (268,269)
Series D Convertible Preferred Stock |  |  |  |
Costs and expenses: |  |  |  |
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance | 0 | 0 | (601,767) | 0
Series E Convertible Preferred Stock |  |  |  |
Costs and expenses: |  |  |  |
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance | $ 0 | $ 0 | $ (2,664,717) | $ 0

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