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]
Revenues	$ 10	$ 38	$ 125	$ 125
Cost of goods sold	34	6	95	45
Gross profit (loss)	(24)	32	30	80
Operating expenses:
Research and development	2,333	1,016	6,611	3,423
Sales and marketing	760	463	2,113	1,106
General and administrative	1,762	882	6,088	6,529
Total operating expenses	4,855	2,361	14,812	11,058
Operating loss	(4,879)	(2,329)	(14,782)	(10,978)
Interest expense		719		1,736
Other (income) expense	12		12	(6)
Loss before income tax provision	(4,891)	(3,048)	(14,794)	(12,708)
Income tax provision	9	5	18	10
Net loss	(4,900)	(3,053)	(14,812)	(12,718)
Total comprehensive loss	$ (4,900)	$ (3,053)	$ (14,812)	$ (12,718)
Net loss per share-basic and diluted	$ (0.37)	$ (0.33)	$ (1.16)	$ (1.39)
Shares used to compute basic and diluted net loss per share	13,335	9,167	12,815	9,167