Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenue from product sales	$ 55	$ 58	$ 168	$ 104
Collaboration revenue	82	0	163	0
Total revenue	137	58	331	104
Cost of product sales	77	547	221	1,340
Cost of collaboration revenue	85	0	88	0
Total cost of revenue	162	547	309	1,340
Gross (loss) profit	(25)	(489)	22	(1,236)
Research and development expense	3,694	2,925	7,681	10,840
Selling, general and administrative expense	3,640	3,182	6,564	5,520
Operating loss	(7,359)	(6,596)	(14,223)	(17,596)
Other income (expense):
Warrant revaluation and other finance income (expense)	602	4,008	(1,061)	958
Other income	0	330	0	370
Interest income	1	1	3	2
Loss before income taxes	(6,756)	(2,257)	(15,281)	(16,266)
Deferred tax benefit	0	0	0	0
Net loss	$ (6,756)	$ (2,257)	$ (15,281)	$ (16,266)
Per Share Information:
Basic net loss (usd per share)	$ (0.17)	$ (0.06)	$ (0.37)	$ (0.40)
Diluted net loss (usd per share)	$ (0.17)	$ (0.09)	$ (0.37)	$ (0.43)
Weighted average number of common shares outstanding
Basic weighted average number of common shares outstanding, shares	40,889,732	40,856,815	40,875,704	40,720,958
Diluted weighted average number of common shares outstanding, shares	40,889,732	41,250,886	40,875,704	40,917,993