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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Segment Reporting (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Subtotal									$ 9,622	$ 9,268	$ 5,649
Net sales									184,634	172,591	162,288
Segment net income (loss)	$ 4,101	$ 958	$ (463)	$ 37	$ (1,422)	$ 151	$ 55	$ (1,123)	2,253	41	4,533
Depreciation and amortization									12,719	9,987	5,994
Total assets	226,277	235,837							226,277	235,837	183,849
Subtotal
Segment Reporting Information [Line Items]
Subtotal									194,256	181,859	167,937
Eliminations
Segment Reporting Information [Line Items]
Subtotal									(9,622)	(9,268)	(5,649)
Mobile communication \| United States
Segment Reporting Information [Line Items]
Subtotal									86,272	87,197	79,828
Mobile communication \| Canada
Segment Reporting Information [Line Items]
Subtotal									2,086	605	501
Mobile communication \| Europe
Segment Reporting Information [Line Items]
Subtotal									23,604	22,180	19,026
Mobile communication \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									33,482	19,938	8,796
Guidance and Stabilization \| United States
Segment Reporting Information [Line Items]
Subtotal									10,537	13,807	7,892
Guidance and Stabilization \| Canada
Segment Reporting Information [Line Items]
Subtotal									17,151	13,982	13,810
Guidance and Stabilization \| Europe
Segment Reporting Information [Line Items]
Subtotal									4,371	4,351	7,421
Guidance and Stabilization \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									7,131	10,531	25,014
Americas
Segment Reporting Information [Line Items]
Subtotal									8,779	5,366	3,465
Net sales									131,638	133,938	137,379
Segment net income (loss)									2,682	(1,390)	5,260
Depreciation and amortization									4,800	4,532	4,521
Total assets	144,219	127,920							144,219	127,920	136,051
Americas \| Subtotal
Segment Reporting Information [Line Items]
Subtotal									140,417	139,304	140,844
Americas \| Eliminations
Segment Reporting Information [Line Items]
Subtotal									(8,779)	(5,366)	(3,465)
Americas \| Mobile communication \| United States
Segment Reporting Information [Line Items]
Subtotal									84,674	85,670	78,729
Americas \| Mobile communication \| Canada
Segment Reporting Information [Line Items]
Subtotal									2,002	539	462
Americas \| Mobile communication \| Europe
Segment Reporting Information [Line Items]
Subtotal									469	482	455
Americas \| Mobile communication \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									5,303	4,576	3,596
Americas \| Guidance and Stabilization \| United States
Segment Reporting Information [Line Items]
Subtotal									10,537	13,807	7,892
Americas \| Guidance and Stabilization \| Canada
Segment Reporting Information [Line Items]
Subtotal									17,151	13,982	13,810
Americas \| Guidance and Stabilization \| Europe
Segment Reporting Information [Line Items]
Subtotal									4,371	4,351	7,421
Americas \| Guidance and Stabilization \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									7,131	10,531	25,014
Europe and Asia
Segment Reporting Information [Line Items]
Subtotal									843	3,902	2,184
Net sales									52,996	38,653	24,909
Segment net income (loss)									(429)	1,431	(727)
Depreciation and amortization									7,919	5,455	1,473
Total assets	$ 82,058	$ 107,917							82,058	107,917	47,798
Europe and Asia \| Subtotal
Segment Reporting Information [Line Items]
Subtotal									53,839	42,555	27,093
Europe and Asia \| Eliminations
Segment Reporting Information [Line Items]
Subtotal									(843)	(3,902)	(2,184)
Europe and Asia \| Mobile communication \| United States
Segment Reporting Information [Line Items]
Subtotal									1,598	1,527	1,099
Europe and Asia \| Mobile communication \| Canada
Segment Reporting Information [Line Items]
Subtotal									84	66	39
Europe and Asia \| Mobile communication \| Europe
Segment Reporting Information [Line Items]
Subtotal									23,135	21,698	18,571
Europe and Asia \| Mobile communication \| Other Geographic Areas
Segment Reporting Information [Line Items]
Subtotal									28,179	15,362	5,200
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