Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue from product sales	$ 49	$ 20	$ 217	$ 124
Collaboration revenue	30	0	193	0
Total revenue	79	20	410	124
Cost of product sales	62	512	283	1,852
Cost of collaboration revenue	142	0	230	0
Total cost of revenue	204	512	513	1,852
Gross loss	(125)	(492)	(103)	(1,728)
Research and development expense	4,221	3,069	11,902	13,909
Selling, general and administrative expense	2,477	2,630	9,041	8,150
Operating loss	(6,823)	(6,191)	(21,046)	(23,787)
Other income:
Warrant revaluation and other finance income	5,301	177	4,240	1,135
Other income	0	0	0	370
Interest income	1	2	4	4
Loss before income taxes	(1,521)	(6,012)	(16,802)	(22,278)
Income tax benefit	0	0	0	0
Net loss	$ (1,521)	$ (6,012)	$ (16,802)	$ (22,278)
Per Share Information:
Basic net loss (usd per share)	$ (0.04)	$ (0.15)	$ (0.40)	$ (0.55)
Diluted net loss (usd per share)	$ (0.07)	$ (0.17)	$ (0.44)	$ (0.60)
Weighted average number of common shares outstanding:
Basic weighted average number of common shares outstanding, shares	43,021,121	40,856,815	41,598,632	40,766,741
Diluted weighted average number of common shares outstanding, shares	43,712,918	41,300,105	41,829,231	41,045,861