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Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating expenses:
Research and development	$ 6,818	$ 5,931	$ 13,254	$ 10,547
General and administrative	2,578	1,833	5,348	3,578
Total operating expenses	9,396	7,764	18,602	14,125
Loss from operations	(9,396)	(7,764)	(18,602)	(14,125)
Other (expense) income:
Interest expense	(220)	(279)	(463)	(428)
Interest and investment income	80		133
Other income, net	91	4	69	13
Total other expense, net	(49)	(275)	(261)	(415)
Net loss	$ (9,445)	$ (8,039)	$ (18,863)	$ (14,540)
Net loss per share - basic and diluted (in dollars per share)	$ (0.61)	$ (8.07)	$ (1.23)	$ (19.46)
Weighted-average common shares outstanding used in net loss per share - basic and diluted (in shares)	15,373,964	996,592	15,354,740	747,117

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