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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating expenses:        
Research and development $ 1,599,045 $ 1,364,728 $ 4,691,250 $ 3,577,357
General and administrative 376,796 164,665 1,290,082 551,555
Total operating expenses 1,975,841 1,529,393 5,981,332 4,128,912
Loss from operations (1,975,841) (1,529,393) (5,981,332) (4,128,912)
Other income (expense)        
Interest expense (65) (264,905) (65) (451,664)
Interest income 104,799 30,322 325,883 53,034
Other income (expense), net 104,734 (234,583) 325,818 (398,630)
Net loss before income taxes (1,871,107) (1,763,976) (5,655,514) (4,527,542)
Income tax benefits 0 0 0 0
Net loss $ (1,871,107) $ (1,763,976) $ (5,655,514) $ (4,527,542)
Net loss per share, basic and diluted $ (0.18) $ (0.26) $ (0.56) $ (0.69)
Weighted average common shares outstanding, basic and diluted 10,128,606 6,846,827 10,111,843 6,577,191