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Segment Reporting (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Schedule of operations by geographic segment
Net sales and operating earnings (loss) for the Company's reporting segments and the Company's loss before income tax expense for the three months ended March 31, 2018 and 2017 were as follows:

 
Three Months Ended
March 31,
 
2018
 
2017
Net sales:
 
 
 
Mobile connectivity
$
32,749

 
$
34,287

Inertial navigation
7,352

 
5,924

     Consolidated net sales
$
40,101

 
$
40,211

 
 
 
 
Operating earnings (loss):
 
 
 
Mobile connectivity
$
1,072

 
$
622

Inertial navigation
334

 
(44
)
     Subtotal
1,406

 
578

Unallocated, net
(4,586
)
 
(5,048
)
     Loss from operations
(3,180
)
 
(4,470
)
Net interest and other expense
(535
)
 
(255
)
     Loss before income tax expense
$
(3,715
)
 
$
(4,725
)
Depreciation expense and amortization expense for the Company's reporting segments for the three months ended March 31, 2018 and 2017 were as follows:
 
Three Months Ended
March 31,
 
2018
 
2017
Depreciation expense:
 
 
 
Mobile connectivity
1,470

 
1,478

Inertial navigation
218

 
195

Unallocated
265

 
20

     Total consolidated depreciation expense
1,953

 
1,693

 
 
 
 
Amortization expense:
 
 
 
Mobile connectivity
1,097

 
1,068

Inertial navigation
—

 
—

Unallocated
—

 
—

     Total consolidated amortization expense
1,097

 
1,068