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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement [Abstract] |  |  |  |
Licensing revenue | $ 125,000 | $ 125,000 | $ 375,000 | $ 375,000
Operating expenses: |  |  |  |
Research and development | 2,187,317 | 3,348,847 | 9,521,937 | 9,870,754
General and administrative | 1,959,903 | 1,174,250 | 7,167,740 | 4,291,482
Total operating expenses | 4,147,220 | 4,523,097 | 16,689,677 | 14,162,236
Loss from operations | (4,022,220) | (4,398,097) | (16,314,677) | (13,787,236)
Other (expense) income: |  |  |  |
Gain from change in valuation of earn-out milestone liability | 4,114,995 | 1,246,151 | 3,567,671 | 670,172
Impairment of in-process research and development | (4,510,000) | (2,520,000) | (4,510,000) | (2,520,000)
Investment income | 106,565 | 524 | 253,750 | 3,941
Interest expense | (345,728) |  | (360,759) | (91,756)
Other income | 2 | 93 | 78 | 3,545
Total other (expense) income, net | (634,166) | (1,273,232) | (1,049,260) | (1,934,098)
Net loss | (4,656,386) | (5,671,329) | (17,363,937) | (15,721,334)
Deemed dividend related to warrant modification |  |  |  | (345,685)
Net loss attributable to common shareholders | $ (4,656,386) | $ (5,671,329) | $ (17,363,937) | $ (16,067,019)
Net loss per common share |  |  |  |
Basic and diluted | $ (0.26) | $ (0.70) | $ (1.00) | $ (3.04)
Weighted average shares outstanding |  |  |  |
Basic and diluted | 17,801,230 | 8,054,658 | 17,447,921 | 5,171,699

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