Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating expenses:
Research and development	$ 5,777,160	$ 382,106	$ 13,533,612	$ 818,704
General and administrative	3,218,601	293,220	6,049,175	925,506
Total operating expenses	8,995,761	675,326	19,582,787	1,744,210
Loss from operations	(8,995,761)	(675,326)	(19,582,787)	(1,744,210)
Other income (expense):
Interest income	45,765	401	72,563	1,063
Interest expense		(40,000)		(397,064)
Total other income (expense), net	45,765	(39,599)	72,563	(396,001)
Net loss before income tax expense	(8,949,996)	(714,925)	(19,510,224)	(2,140,211)
Income tax expense				(247,500)
Net loss and comprehensive loss	(8,949,996)	(714,925)	(19,510,224)	(2,387,711)
Gain on extinguishment of convertible stock			4,798,194
Accretion of redeemable preferred stock			(12,552,830)
Net loss attributable to common stockholders	$ (8,949,996)	$ (714,925)	$ (27,264,860)	$ (2,387,711)
Per common share information:
Net loss available to common stockholders, basic and diluted	$ (0.59)	$ (4.97)	$ (3.27)	$ (17.05)
Weighted-average common shares outstanding, basic and diluted	15,153,135	143,810	8,336,147	140,029
Comprehensive loss:
Net loss	$ (8,949,996)	$ (714,925)	$ (27,264,860)	$ (2,387,711)
Other comprehensive loss:
Unrealized loss on marketable securities	(9,274)		(9,274)
Comprehensive loss	$ (8,959,270)	$ (714,925)	$ (27,274,134)	$ (2,387,711)