Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Sales		$ 61		$ 267
Operating Expenses
Cost of goods sold		202		660
Research and development	$ 7,048	9,067	$ 21,111	21,960
Sales and marketing	413	456	1,161	1,323
General and administrative	1,762	1,481	5,607	4,757
Amortization of intangible assets	338	125	589	376
Acquisition related costs	4,003		4,003
Total Operating Expenses	13,564	11,331	32,471	29,076
Operating Loss	(13,564)	(11,270)	(32,471)	(28,809)
Other Expense
Interest Expense, net	(436)	(237)	(997)	(764)
Total Other Expense, net	(436)	(237)	(997)	(764)
Loss before income taxes	(14,000)	(11,507)	(33,468)	(29,573)
Income tax benefit	99		99
Net loss	(13,901)	(11,507)	(33,369)	(29,573)
Other comprehensive loss
Foreign currency translation loss	(429)		(429)
Comprehensive loss	$ (14,330)	$ (11,507)	$ (33,798)	$ (29,573)
Net loss per share - basic and diluted	$ (0.16)	$ (0.18)	$ (0.46)	$ (0.52)
Weighted average common shares outstanding - basic and diluted	86,044	63,068	72,713	57,212