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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement [Abstract] |  |  |  |
Licensing revenue | $ 125,000 | $ 125,000 | $ 375,000 | $ 375,000
Operating expenses: |  |  |  |
Research and development | 3,674,239 | 2,187,317 | 9,999,972 | 9,521,937
General and administrative | 1,838,287 | 1,959,903 | 6,192,835 | 7,167,740
Total operating expenses | 5,512,526 | 4,147,220 | 16,192,807 | 16,689,677
Loss from operations | (5,387,526) | (4,022,220) | (15,817,807) | (16,314,677)
Other (expense) income: |  |  |  |
Gain from change in valuation of earn-out milestone liability | 85,882 | 4,114,995 | 3,088,821 | 3,567,671
Fair value of warrants issued in connection with amendment to modify GEN-1 earn-out milestone payments |  |  | (400,000) |
Impairment of in-process research and development |  | (4,510,000) |  | (4,510,000)
Investment income | 174,439 | 106,565 | 432,832 | 253,750
Interest expense | (349,602) | (345,728) | (1,049,797) | (360,759)
Other (expense) income |  | 2 | (2,823) | 78
Total other (expense) income, net | (89,281) | (634,166) | 2,069,033 | (1,049,260)
Net loss | $ (5,476,807) | $ (4,656,386) | $ (13,748,774) | $ (17,363,937)
Net loss per common share |  |  |  |
Basic and diluted | $ (0.25) | $ (0.26) | $ (0.67) | $ (1.00)
Weighted average shares outstanding |  |  |  |
Basic and diluted | 21,662,824 | 17,801,230 | 20,524,799 | 17,447,921

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