Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Inthinc [Member]	Series A Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member] Inthinc [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Inthinc [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Beginning balances at Dec. 31, 2015	$ 299,756		$ 357	$ 71		$ 381,659		$ (1,174)	$ (81,424)	$ (96)	$ 363
Beginning balances, shares at Dec. 31, 2015			35,759	70,613,642						29,990
Vesting of restricted stock units, shares				261,730
Stock-based compensation	2,337					2,337
Conversion of preferred stock to common stock			$ (7)			7
Conversion of preferred stock to common stock, shares			(708)	1,178
Payment of contingent consideration	352					352
Payment of contingent consideration, shares				35,464
Exercise of SARs, shares				97,074
Net income (loss)	(6,159)								(6,265)		106
Foreign currency translation adjustments	672							678			(6)
Ending balances at Jun. 30, 2016	296,958		$ 350	$ 71		384,355		(496)	(87,689)	$ (96)	463
Ending balances, shares at Jun. 30, 2016			35,051	71,009,088						29,990
Beginning balances at Dec. 31, 2016	281,868		$ 364	$ 71		386,920		(1,089)	(104,949)	$ (96)	647
Beginning balances, shares at Dec. 31, 2016			36,466	71,111,863						29,990
Vesting of restricted stock units	1			$ 1
Vesting of restricted stock units, shares				555,873
Stock-based compensation	2,781					2,781
Proceeds received from issuance of common stock in connection with a private offering	15,000			$ 2		14,998
Proceeds received from issuance of common stock in connection with a private offering, shares				1,552,795
Issuance of common stock in connection with the acquisition of Inthinc		$ 764					$ 764
Issuance of common stock in connection with the acquisition of Inthinc, shares					76,796
Issuance of common stock under employees stock purchase plan	529					529
Issuance of common stock under employees stock purchase plan, shares				75,888
Payment of contingent consideration	347					347
Payment of contingent consideration, shares				40,372
Exercise of SARs, shares				105,067
Net income (loss)	(14,047)								(14,083)		36
Foreign currency translation adjustments	611							616			(5)
Ending balances at Jun. 30, 2017	$ 287,854		$ 364	$ 74		$ 406,339		$ (473)	$ (119,032)	$ (96)	$ 678
Ending balances, shares at Jun. 30, 2017			36,466	73,518,654						29,990