CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Revenue	$ 375	$ 375	$ 1,148	$ 1,150
Operating expense:
Royalty expense	884	1,029	884	5,264
Research and development	460	463	1,391	1,272
Selling, general and administrative expenses	6,318	4,985	20,132	16,043
Total operating expense	7,662	6,477	22,407	22,579
Loss from operations	(7,287)	(6,102)	(21,259)	(21,429)
Loss on change in value of derivative liability	0	0	0	(117)
Interest and other income, net	19	12	50	57
Loss before taxes	(7,268)	(6,090)	(21,209)	(21,489)
Income tax expense	(119)	(7)	(126)	(9)
Net loss	$ (7,387)	$ (6,097)	$ (21,335)	$ (21,498)
Basic and diluted loss per share (in dollars per share)	$ (0.13)	$ (0.12)	$ (0.38)	$ (0.41)
Weighted average shares outstanding basic and diluted (in shares)	56,651	52,339	55,503	52,174