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Condensed Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating expenses:
Research and development	$ 6,766	$ 1,992	$ 15,911	$ 3,236
Cost of in-process research and development acquired				1,607
General and administrative	2,441	1,328	6,474	2,131
Total operating expenses	9,207	3,320	22,385	6,974
Loss from operations	(9,207)	(3,320)	(22,385)	(6,974)
Other income (expense):
Interest income (expense), net	33	1	60	(88)
Change in fair value of convertible notes payable				(183)
Total other income (expense)	33	1	60	(271)
Net loss	(9,174)	(3,319)	(22,325)	(7,245)
Other comprehensive loss:
Unrealized loss on short-term investments	(5)		(5)
Comprehensive loss	$ (9,179)	$ (3,319)	$ (22,330)	$ (7,245)
Net loss per common share, basic and diluted	$ (0.67)	$ (2.98)	$ (2.59)	$ (10.11)
Weighted average shares outstanding used to compute net loss per share, basic and diluted	13,674,568	1,113,439	8,636,087	716,486

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