Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenues	$ 14	$ 153
Cost of goods sold	279	163
Gross loss	(265)	(10)
Operating expenses:
Research and development	5,541	7,935
Sales and marketing	3,103	2,706
General and administrative	6,750	7,479
Total operating expenses	15,394	18,120
Operating loss	(15,659)	(18,130)
Interest expense, net	20
Other expense	2	12
Loss before income tax provision	(15,681)	(18,142)
Income tax provision	76	19
Net loss	(15,757)	(18,161)
Total comprehensive loss	$ (15,757)	$ (18,161)
Net loss per share - basic and diluted	$ (1.18)	$ (1.40)
Weighted average, shares outstanding - basic and diluted	13,337,560	12,945,968