Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Schedule of operations by geographic segment

Net sales and operating (loss) earnings for the Company's reporting segments and the Company's (loss) income before income tax expense for the years ended December 31, 2017, 2016, and 2015 were as follows:

	For the year ended December 31,
	2017			2016			2015
Net sales:
Mobile connectivity	$	132,227		$	141,507		$	147,809
Inertial navigation	27,861			34,615			36,825
Consolidated net sales	$	160,088		$	176,122		$	184,634
Operating earnings (loss):
Mobile connectivity	$	7,334		$	10,041		$	9,459
Inertial navigation	556			5,272			7,934
Subtotal	7,890			15,313			17,393
Unallocated, net	(16,654		)	(16,635		)	(14,185		)
Consolidated (loss) operating earnings	(8,764		)	(1,322		)	3,208
Net interest and other expense	(1,174		)	(648		)	(542		)
(Loss) income before income tax expense	$	(9,938	)	$	(1,970	)	$	2,666

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,
	2017		2016		2015
Depreciation expense:
Mobile connectivity	$	5,720	$	6,084	$	5,843
Inertial navigation	928		1,063		961
Unallocated	77		461		389
Total consolidated depreciation expense	$	6,725	$	7,608	$	7,193
Amortization expense:
Mobile connectivity	$	4,312	$	4,956	$	5,526
Inertial navigation	—		—		—
Unallocated	—		—		—
Total consolidated amortization expense	$	4,312	$	4,956	$	5,526