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Segment Reporting (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2017 and 2016 were as follows:

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Net sales:
 
 
 
 
 
 
 
Mobile connectivity
$
34,034

 
$
36,890

 
$
68,321

 
$
72,155

Inertial navigation
6,415

 
9,076

 
12,339

 
14,191

Consolidated net sales
$
40,449

 
$
45,966

 
$
80,660

 
$
86,346

 
 
 
 
 
 
 
 
Operating earnings (loss):
 
 
 
 
 
 
 
Mobile connectivity
$
2,638

 
$
1,631

 
$
3,260

 
$
3,621

Inertial navigation
362

 
1,596

 
318

 
669

Subtotal
3,000

 
3,227

 
3,578

 
4,290

Unallocated, net
(4,368
)
 
(3,920
)
 
(9,416
)
 
(8,357
)
Loss from operations
(1,368
)
 
(693
)
 
(5,838
)
 
(4,067
)
Net interest and other (expense) income
(302
)
 
(91
)
 
(557
)
 
(438
)
Loss before income tax expense (benefit)
$
(1,670
)
 
$
(784
)
 
$
(6,395
)
 
$
(4,505
)
Depreciation expense and amortization expense for the Company's segments are presented in the following table for the periods presented:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Depreciation expense:
 
 
 
 
 
 
 
Mobile connectivity
$
1,394

 
$
1,567

 
$
2,872

 
$
3,226

Inertial navigation
199

 
224

 
395

 
448

Unallocated
21

 
24

 
40

 
48

Total consolidated depreciation expense
$
1,614

 
$
1,815

 
$
3,307

 
$
3,722

 
 
 
 
 
 
 
 
Amortization expense:
 
 
 
 
 
 
 
Mobile connectivity
$
1,102

 
$
1,250

 
$
2,170

 
$
2,533

Inertial navigation
—

 
—

 
—

 
—

Unallocated
—

 
—

 
—

 
—

Total consolidated amortization expense
$
1,102

 
$
1,250

 
$
2,170

 
$
2,533