Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 22, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Aggregate Fair Value of Assets Acquired and the Liabilities Assumed [Abstract]
Current assets		$ 7,233		$ 7,233
Property, plant and equipment		14,340		14,340
Identifiable intangible assets		16,100		16,100
Other assets		45		45
Total assets assumed		37,718		37,718
Current liabilities		(3,945)		(3,945)
Note payable		(57)		(57)
Other long term liabilities		(116)		(116)
Total liabilities assumed		(4,118)		(4,118)
Net assets acquired		33,600		33,600
Goodwill		8,928		8,928		$ 0
Unaudited Pro-forma Results [Abstract]
Net revenues		8,323	$ 7,816	23,684	$ 21,378
Net loss attributable to common shareholders		$ (12,186)	$ (3,715)	$ (33,662)	$ (20,410)
Net loss per basic and diluted share: (in dollars per share)		$ (1.29)	$ (0.71)	$ (4.21)	$ (4.00)
Shares used in calculating net loss per basic and diluted share: (in shares)		9,442,022	5,216,290	7,994,012	5,108,418
Core Technology [Member]
Business Acquisition [Line Items]
Estimated useful life				10 years
Product Technology [Member]
Business Acquisition [Line Items]
Estimated useful life				5 years
Trade Names [Member]
Business Acquisition [Line Items]
Estimated useful life				10 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Estimated useful life				10 years
XTRAC and VTRAC [Member]
Business Acquisition [Line Items]
Acquisition price	$ 42,528
XTRAC and VTRAC [Member] | Core Technology [Member]
Business Acquisition [Line Items]
Estimated useful life				10 years
XTRAC and VTRAC [Member] | Product Technology [Member]
Business Acquisition [Line Items]
Estimated useful life				5 years