Divestiture of Automatic License Plate Recognition Business (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of discontinued operations		$ 1,081
License Plate Recognition (TagMaster AB) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Revenue		1,409	$ 1,452	$ 2,980
Operating income (loss) from continuing operations		(2,538)	(7,688)	(4,529)
Loss on sale of discontinued operations	$ (1,100)	(1,081)
Income tax expense (benefit)		(134)	(20)	(58)
Net loss on discontinued operations, net of tax		$ (3,485)	$ (7,668)	$ (4,471)