Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Data (Unaudited)

Summary of quarterly results of operations

	March 31, 2015			June 30, 2015			September 30, 2015			December 31, 2015
Total revenue	$	—		$	—		$	—		$	—
Operating expenses	$	6,977		$	7,982		$	8,965		$	9,165
Net loss	$	(8,538	)	$	(8,486	)	$	(9,411	)	$	(3,899	)
Basic net loss per common share	$	(0.40	)	$	(0.38	)	$	(0.42	)	$	(0.17	)
Diluted net loss per common share	$	(0.40	)	$	(0.38	)	$	(0.42	)	$	(0.17	)

	March 31, 2014		June 30, 2014			September 30, 2014			December 31, 2014
Total revenue	$	—	$	—		$	—		$	—
Operating expenses	$	2,448	$	3,495		$	6,049		$	6,524
Net income (loss)	$	839	$	(3,718	)	$	(6,353	)	$	(6,845	)
Basic net income (loss) per common share	$	0.10	$	(0.46	)	$	(0.34	)	$	(0.37	)
Diluted net income (loss) per common share	$	0.01	$	(0.46	)	$	(0.34	)	$	(0.37	)