Selected Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Selected Quarterly Financial Information (Unaudited)

Schedule of selected quarterly financial information

Year Ended December 31, 2013	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Contract and grant revenue	$	233		$	133		$	—		$	21
Total operating expenses	$	5,844		$	7,003		$	9,321		$	12,169
Loss from operations	$	(5,611	)	$	(6,870	)	$	(9,321	)	$	(12,148	)
Total other income (expense)	$	—		$	1		$	—		$	2
Net loss	$	(5,611	)	$	(6,869	)	$	(9,321	)	$	(12,146	)
Net loss per share applicable to common stockholders, basic and diluted	$	(2.52	)	$	(2.86	)	$	(3.66	)	$	(0.72	)

Year Ended December 31, 2012	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Contract and grant revenue	$	34		$	533		$	34		$	33
Total operating expenses	$	4,017		$	4,567		$	3,669		$	4,271
Loss from operations	$	(3,983	)	$	(4,034	)	$	(3,635	)	$	(4,238	)
Total other income (expense)	$	1		$	1		$	—		$	—
Net loss	$	(3,982	)	$	(4,033	)	$	(3,635	)	$	(4,238	)
Net loss per share applicable to common stockholders, basic and diluted	$	(2.71	)	$	(2.37	)	$	(1.97	)	$	(2.08	)