Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	MobileNet [Member]	Euroscan Holding B.V. [Member]	Series A Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member] MobileNet [Member]	Common Stock [Member] Euroscan Holding B.V. [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] MobileNet [Member]	Additional Paid-in Capital [Member] Euroscan Holding B.V. [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Beginning balances at Dec. 31, 2012	$ 182,388			$ 1,612	$ 47			$ 248,469			$ 633	$ (67,956)	$ (96)	$ (321)
Beginning balances, shares at Dec. 31, 2012				161,359	46,783,568								29,990
Vesting of restricted stock units, shares					93,821
Stock-based compensation	2,779							2,779
Conversion of Series A convertible preferred stock to common stock				$ (652)				652
Conversion of Series A convertible preferred stock to common stock, shares				(65,237)	108,688
Issuance of common stock in connection with the acquisition		$ 1,633							$ 1,633
Issuance of common stock in connection with the acquisition, shares						329,344
Exercise of stock options	1,826				$ 1			1,825
Exercise of stock options, shares					647,177
Exercise of SARs, shares					253,882
Series A convertible preferred stock dividend				$ 59								(59)
Series A convertible preferred stock dividend, shares				5,932
Net (loss) income	4,759											4,599		160
Foreign currency translation adjustments	(437)										(398)			(39)
Ending balances at Dec. 31, 2013	192,948			$ 1,019	$ 48			255,358			235	(63,416)	$ (96)	(200)
Ending balances, shares at Dec. 31, 2013				102,054	48,216,480								29,990
Vesting of restricted stock units, shares					289,538
Stock-based compensation	3,519							3,519
Proceeds received from issuance of common stock in connection with public offerings, net of underwriters’ discounts and commissions and offering costs	114,738				$ 21			114,717
Proceeds received from issuance of common stock in connection with public offerings, net of underwriters’ discounts and commissions and offering costs, shares					21,110,714
Common stock issued as form of payment for MPUs	213							213
Common stock issued as payment for MPUs, shares					33,594
Conversion of Series A convertible preferred stock to common stock				$ (147)				147
Conversion of Series A convertible preferred stock to common stock, shares				(14,850)	24,740
Issuance of common stock in connection with the acquisition			$ 2,243				$ 1			$ 2,242
Issuance of common stock in connection with the acquisition, shares							291,230
Exercise of stock options	101							101
Exercise of stock options, shares					33,459
Exercise of SARs, shares					109,733
Series A convertible preferred stock dividend				$ 37								(37)
Series A convertible preferred stock dividend, shares				3,769
Net (loss) income	(4,525)											(4,684)		159
Foreign currency translation adjustments	(728)										(818)			90
Ending balances at Dec. 31, 2014	308,509			$ 909	$ 70			376,297			(583)	(68,137)	$ (96)	49
Ending balances, shares at Dec. 31, 2014				90,973	70,109,488								29,990
Vesting of restricted stock units, shares					227,382
Stock-based compensation	4,172							4,172
Common stock issued as form of payment for MPUs	358							358
Common stock issued as payment for MPUs, shares					54,801
Conversion of Series A convertible preferred stock to common stock	1			$ (588)	$ 1			588
Conversion of Series A convertible preferred stock to common stock, shares				(58,879)	97,935
Exercise of stock options	244							244
Exercise of stock options, shares					50,000
Exercise of SARs, shares					74,036
Series A convertible preferred stock dividend				$ 36								(36)
Series A convertible preferred stock dividend, shares				3,665
Net (loss) income	(12,999)											(13,251)		252
Foreign currency translation adjustments	(529)										(591)			62
Ending balances at Dec. 31, 2015	$ 299,756			$ 357	$ 71			$ 381,659			$ (1,174)	$ (81,424)	$ (96)	$ 363
Ending balances, shares at Dec. 31, 2015				35,759	70,613,642								29,990