Selected Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

The following amounts are in thousands, except per share amounts:

	Quarter Ended
	March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
	(unaudited)
Total revenues	$	564		$	882		$	129		$	24
Net loss attributable to common stockholders	$	(2,941	)	$	(3,634	)	$	(3,994	)	$	(5,406	)
Basic and diluted net loss per share attributable to common stockholders	$	(8.14	)	$	(9.84	)	$	(10.81	)	$	(14.71	)

	Quarter Ended
	March 31, 2014			June 30, 2014			September 30, 2014			December 31, 2014
	(unaudited)
Total revenues	$	25		$	1,064		$	3,544		$	1,800
Net loss attributable to common stockholders	$	(8,223	)	$	(6,126	)	$	(6,682	)	$	(13,120	)
Basic and diluted net loss per share attributable to common stockholders	$	(22.25	)	$	(16.57	)	$	(0.55	)	$	(0.78	)