Unaudited Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 64	$ 64	$ 129	$ 129
Operating expenses:
Research and development, net	6,659	3,282	11,402	7,069
Selling, general and administrative	1,673	3,275	4,207	5,485
Total operating expenses	8,332	6,557	15,609	12,554
Loss from operations	(8,268)	(6,493)	(15,480)	(12,425)
Other (income) expense:
Warrant liability fair value adjustment	(101)	0	(101)	0
Interest income	(39)	(1)	(67)	(2)
Total other income	(140)	(1)	(168)	(2)
Loss from continuing operations before tax	(8,128)	(6,492)	(15,312)	(12,423)
Discontinued operations:
Loss from discontinued operations	0	(3,005)	0	(3,458)
Net loss	$ (8,128)	$ (9,497)	$ (15,312)	$ (15,881)
Income (loss) per share attributable to common stockholders - basic
Continuing operations, per basic share (USD per share)	$ (0.56)	$ (0.53)	$ (1.07)	$ (1.20)
Discontinued operations, per basic share (USD per share)	0.00	(0.25)	0.00	(0.33)
Net loss per share - basic (USD per share)	$ (0.56)	$ (0.78)	$ (1.07)	$ (1.53)
Weighted average common shares outstanding:
Weighted average common shares outstanding, basic and diluted (in shares)	14,590,733	12,249,487	14,248,166	10,393,289