Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Schedule of operations by geographic segment

	Sales Originating From
Three months ended June 30, 2016	Americas			Europe and Asia			Total
Mobile communication sales to the United States	$	22,760		$	748		$	23,508
Mobile communication sales to Canada	353			198			551
Mobile communication sales to Europe	391			7,418			7,809
Mobile communication sales to other geographic areas	1,083			3,370			4,453
Guidance and stabilization sales to the United States	2,827			—			2,827
Guidance and stabilization sales to Canada	4,847			—			4,847
Guidance and stabilization sales to Europe	1,073			—			1,073
Guidance and stabilization sales to other geographic areas	898			—			898
Intercompany sales	1,577			760			2,337
Subtotal	35,809			12,494			48,303
Eliminations	(1,577		)	(760		)	(2,337		)
Net sales	$	34,232		$	11,734		$	45,966
Segment net (loss) income	$	(1,639	)	$	833		$	(806	)
Depreciation and amortization	$	1,206		$	1,860		$	3,066
Total assets	$	132,547		$	76,625		$	209,172

	Sales Originating From
Three months ended June 30, 2015	Americas			Europe and Asia			Total
Mobile communication sales to the United States	$	22,275		$	424		$	22,699
Mobile communication sales to Canada	701			18			719
Mobile communication sales to Europe	221			6,144			6,365
Mobile communication sales to other geographic areas	1,080			7,176			8,256
Guidance and stabilization sales to the United States	1,986			—			1,986
Guidance and stabilization sales to Canada	1,582			—			1,582
Guidance and stabilization sales to Europe	1,545			—			1,545
Guidance and stabilization sales to other geographic areas	1,703			—			1,703
Intercompany sales	2,508			1,047			3,555
Subtotal	33,601			14,809			48,410
Eliminations	(2,508		)	(1,047		)	(3,555		)
Net sales	$	31,093		$	13,762		$	44,855
Segment net income (loss)	$	77		$	(40	)	$	37
Depreciation and amortization	$	1,206		$	1,938		$	3,144
Total assets	$	143,007		$	88,442		$	231,449