Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Subtotal									$ 9,268us-gaap_Revenues	$ 5,649us-gaap_Revenues	$ 10,549us-gaap_Revenues
Net sales									172,591us-gaap_SalesRevenueNet	162,288us-gaap_SalesRevenueNet	137,112us-gaap_SalesRevenueNet
Segment net (loss) income	958us-gaap_NetIncomeLoss	151us-gaap_NetIncomeLoss	55us-gaap_NetIncomeLoss	(1,123)us-gaap_NetIncomeLoss	(365)us-gaap_NetIncomeLoss	1,386us-gaap_NetIncomeLoss	1,549us-gaap_NetIncomeLoss	1,963us-gaap_NetIncomeLoss	41us-gaap_NetIncomeLoss	4,533us-gaap_NetIncomeLoss	3,580us-gaap_NetIncomeLoss
Depreciation and amortization									9,987	5,994	4,610
Total assets	235,837us-gaap_Assets				183,849us-gaap_Assets				235,837us-gaap_Assets	183,849us-gaap_Assets	137,568us-gaap_Assets
Subtotal
Segment Reporting Information [Line Items]
Subtotal									181,859	167,937	147,661
Eliminations
Segment Reporting Information [Line Items]
Subtotal									(9,268)	(5,649)	(10,549)
Mobile communication \| United States
Segment Reporting Information [Line Items]
Subtotal									87,197	79,828	62,857
Mobile communication \| Canada
Segment Reporting Information [Line Items]
Subtotal									605	501	777
Mobile communication \| Europe
Segment Reporting Information [Line Items]
Subtotal									22,180	19,026	15,672
Mobile communication \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									19,938	8,796	8,379
Guidance and Stabilization \| United States
Segment Reporting Information [Line Items]
Subtotal									13,807	7,892	8,632
Guidance and Stabilization \| Canada
Segment Reporting Information [Line Items]
Subtotal									13,982	13,810	10,736
Guidance and Stabilization \| Europe
Segment Reporting Information [Line Items]
Subtotal									4,351	7,421	11,793
Guidance and Stabilization \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									10,531	25,014	18,266
Americas
Segment Reporting Information [Line Items]
Subtotal									5,366	3,465	8,485
Net sales									133,938	137,379	117,414
Segment net (loss) income									(1,390)	5,260	4,316
Depreciation and amortization									4,532	4,521	4,116
Total assets	127,920				136,051				127,920	136,051	118,076
Americas \| Subtotal
Segment Reporting Information [Line Items]
Subtotal									139,304	140,844	125,899
Americas \| Eliminations
Segment Reporting Information [Line Items]
Subtotal									(5,366)	(3,465)	(8,485)
Americas \| Mobile communication \| United States
Segment Reporting Information [Line Items]
Subtotal									85,670	78,729	62,857
Americas \| Mobile communication \| Canada
Segment Reporting Information [Line Items]
Subtotal									539	462	777
Americas \| Mobile communication \| Europe
Segment Reporting Information [Line Items]
Subtotal									482	455	417
Americas \| Mobile communication \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									4,576	3,596	3,936
Americas \| Guidance and Stabilization \| United States
Segment Reporting Information [Line Items]
Subtotal									13,807	7,892	8,632
Americas \| Guidance and Stabilization \| Canada
Segment Reporting Information [Line Items]
Subtotal									13,982	13,810	10,736
Americas \| Guidance and Stabilization \| Europe
Segment Reporting Information [Line Items]
Subtotal									4,351	7,421	11,793
Americas \| Guidance and Stabilization \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									10,531	25,014	18,266
Europe and Asia
Segment Reporting Information [Line Items]
Subtotal									3,902	2,184	2,064
Net sales									38,653	24,909	19,698
Segment net (loss) income									1,431	(727)	(736)
Depreciation and amortization									5,455	1,473	494
Total assets	107,917				47,798				107,917	47,798	19,492
Europe and Asia \| Subtotal
Segment Reporting Information [Line Items]
Subtotal									42,555	27,093	21,762
Europe and Asia \| Eliminations
Segment Reporting Information [Line Items]
Subtotal									(3,902)	(2,184)	(2,064)
Europe and Asia \| Mobile communication \| United States
Segment Reporting Information [Line Items]
Subtotal									1,527	1,099	0
Europe and Asia \| Mobile communication \| Canada
Segment Reporting Information [Line Items]
Subtotal									66	39	0
Europe and Asia \| Mobile communication \| Europe
Segment Reporting Information [Line Items]
Subtotal									21,698	18,571	15,255
Europe and Asia \| Mobile communication \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									15,362	5,200	4,443
Europe and Asia \| Guidance and Stabilization \| United States
Segment Reporting Information [Line Items]
Subtotal									0	0	0
Europe and Asia \| Guidance and Stabilization \| Canada
Segment Reporting Information [Line Items]
Subtotal									0	0	0
Europe and Asia \| Guidance and Stabilization \| Europe
Segment Reporting Information [Line Items]
Subtotal									0	0	0
Europe and Asia \| Guidance and Stabilization \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									$ 0	$ 0	$ 0