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Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Schedule of operations by geographic segment
Net sales and operating income (loss) for the Company's reporting segments and the Company's loss before income tax expense for the three and six months ended June 30, 2018 and 2017 were as follows:

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Net sales:
 
 
 
 
 
 
 
Mobile connectivity
$
33,764

 
$
34,034

 
$
66,513

 
$
68,321

Inertial navigation
9,628

 
6,415

 
16,980

 
12,339

Consolidated net sales
$
43,392

 
$
40,449

 
$
83,493

 
$
80,660

 
 
 
 
 
 
 
 
Operating income (loss):
 
 
 
 
 
 
 
Mobile connectivity
$
1,149

 
$
2,638

 
$
2,221

 
$
3,260

Inertial navigation
1,564

 
362

 
1,898

 
318

Subtotal
2,713

 
3,000

 
4,119

 
3,578

Unallocated, net
(3,900
)
 
(4,368
)
 
(8,486
)
 
(9,416
)
Loss from operations
(1,187
)
 
(1,368
)
 
(4,367
)
 
(5,838
)
Net interest and other income (expense)
173

 
(302
)
 
(362
)
 
(557
)
Loss before income tax expense
$
(1,014
)
 
$
(1,670
)
 
(4,729
)
 
$
(6,395
)
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,
 
2018
 
2017
 
2018
 
2017
Depreciation expense:
 
 
 
 
 
 
 
Mobile connectivity
$
1,810

 
$
1,394

 
$
3,370

 
$
2,872

Inertial navigation
254

 
199

 
506

 
395

Unallocated
128

 
21

 
269

 
40

Total consolidated depreciation expense
$
2,192

 
$
1,614

 
$
4,145

 
$
3,307

 
 
 
 
 
 
 
 
Amortization expense:
 
 
 
 
 
 
 
Mobile connectivity
$
1,046

 
$
1,102

 
$
2,143

 
$
2,170

Inertial navigation
—

 
—

 
—

 
—

Unallocated
—

 
—

 
—

 
—

Total consolidated amortization expense
$
1,046

 
$
1,102

 
$
2,143

 
$
2,170