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Segment Reporting (Tables)
 9 Months Ended
Sep. 30, 2017
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 (benefit) for the three and nine months ended September 30, 2017 and 2016 were as follows:

 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Net sales:
 
 
 
 
 
 
 
Mobile connectivity
$
32,762

 
$
36,453

 
$
101,083

 
$
108,608

Inertial navigation
7,688

 
9,393

 
20,027

 
23,584

Consolidated net sales
$
40,450

 
$
45,846

 
$
121,110

 
$
132,192

 
 
 
 
 
 
 
 
Operating (loss) earnings:
 
 
 
 
 
 
 
Mobile connectivity
$
2,067

 
$
4,556

 
$
5,327

 
$
8,177

Inertial navigation
349

 
2,126

 
667

 
2,795

Subtotal
2,416

 
6,682

 
5,994

 
10,972

Unallocated, net
(4,217
)
 
(3,669
)
 
(13,633
)
 
(12,026
)
(Loss) income from operations
(1,801
)
 
3,013

 
(7,639
)
 
(1,054
)
Net interest and other (expense) income
(354
)
 
(279
)
 
(911
)
 
(717
)
(Loss) income before income tax expense (benefit)
$
(2,155
)
 
$
2,734

 
$
(8,550
)
 
$
(1,771
)
Depreciation expense and amortization expense for the Company's segments are presented in the following table for the periods presented:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Depreciation expense:
 
 
 
 
 
 
 
Mobile connectivity
$
1,339

 
$
1,447

 
$
4,212

 
$
4,673

Inertial navigation
293

 
218

 
687

 
667

Unallocated
17

 
25

 
57

 
72

Total consolidated depreciation expense
$
1,649

 
$
1,690

 
$
4,956

 
$
5,412

 
 
 
 
 
 
 
 
Amortization expense:
 
 
 
 
 
 
 
Mobile connectivity
$
1,096

 
$
1,145

 
$
3,266

 
$
3,678

Inertial navigation
—

 
—

 
—

 
—

Unallocated
—

 
—

 
—

 
—

Total consolidated amortization expense
$
1,096

 
$
1,145

 
$
3,266

 
$
3,678