Consolidated Statements of Operations and Comprehensive Loss (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Sales	$ 61	$ 362	$ 267	$ 1,212
Operating Expenses
Cost of goods sold	202	2,058	660	4,096
Research and development	9,067	2,909	21,960	7,855
Sales and marketing	456	438	1,323	1,490
General and administrative	1,606	1,278	5,133	2,665
Merger expenses		2,891		2,891
Total Operating Expenses	11,331	9,574	29,076	18,997
Operating Loss	(11,270)	(9,212)	(28,809)	(17,785)
Other Expense
Remeasurement of fair value of preferred stock warrant liability		(1,800)		(1,800)
Interest expense, net	(237)	(253)	(764)	(742)
Total Other Expense, net	(237)	(2,053)	(764)	(2,542)
Net Loss	(11,507)	(11,265)	(29,573)	(20,327)
Other comprehensive income (loss)
Comprehensive loss	$ (11,507)	$ (11,265)	$ (29,573)	$ (20,327)
Net loss per share - basic and diluted	$ (0.18)	$ (1.06)	$ (0.52)	$ (4.75)
Weighted average common shares outstanding - basic and diluted	63,068	10,584	57,212	4,282