Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of reporting segments

Net sales and operating income (loss) for the Company's reporting segments and the Company's loss before income tax expense for the years ended December 31, 2018, 2017, and 2016 were as follows:

	For the year ended December 31,
	2018			2017			2016
Net sales:
Mobile connectivity	$	133,658		$	132,227		$	141,507
Inertial navigation	37,103			27,861			34,615
Consolidated net sales	$	170,761		$	160,088		$	176,122
Operating income (loss):
Mobile connectivity	$	4,163		$	7,334		$	10,041
Inertial navigation	4,917			556			5,272
Subtotal	9,080			7,890			15,313
Unallocated, net	(16,244		)	(16,654		)	(16,635		)
Loss from operations	(7,164		)	(8,764		)	(1,322		)
Net interest and other income (expense)	(503		)	(1,174		)	(648		)
Loss before income tax expense	$	(7,667	)	$	(9,938	)	$	(1,970	)

Depreciation expense and amortization expense for the Company's segments are presented in the table that follows for the periods presented:

	For the year ended December 31,
	2018		2017		2016
Depreciation expense:
Mobile connectivity	$	7,224	$	5,720	$	6,084
Inertial navigation	1,048		928		1,063
Unallocated	538		77		461
Total consolidated depreciation expense	$	8,810	$	6,725	$	7,608
Amortization expense:
Mobile connectivity	$	4,047	$	4,312	$	4,956
Inertial navigation	—		—		—
Unallocated	—		—		—
Total consolidated amortization expense	$	4,047	$	4,312	$	4,956