Unaudited Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue	$ 64	$ 65
Operating expenses:
Research and development, net	4,743	3,787
Selling, general and administrative	2,533	2,210
Total operating expenses	7,276	5,997
Loss from operations	(7,212)	(5,932)
Other (income) expense:
Interest income	(28)	(1)
Total other income	(28)	(1)
Loss from continuing operations before tax	(7,184)	(5,931)
Discontinued operations:
Loss from discontinued operations	0	(453)
Net loss	$ (7,184)	$ (6,384)
Income (loss) per share attributable to common stockholders - basic
Continuing operations, per basic share (USD per share)	$ (0.52)	$ (0.70)
Discontinued operations, per basic share (USD per share)	0.00	(0.05)
Net loss per share - basic (USD per share)	$ (0.52)	$ (0.75)
Weighted average common shares outstanding:
Weighted average common shares outstanding, basic and diluted (in shares)	13,905,613	8,516,467