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Segment Reporting (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2018 and 2017 were as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Net sales:
 
 
 
 
 
 
 
Mobile connectivity
$
33,425

 
$
32,762

 
$
99,938

 
$
101,083

Inertial navigation
10,092

 
7,688

 
27,072

 
20,027

Consolidated net sales
$
43,517

 
$
40,450

 
$
127,010

 
$
121,110

 
 
 
 
 
 
 
 
Operating income (loss):
 
 
 
 
 
 
 
Mobile connectivity
$
1,443

 
$
2,067

 
$
3,664

 
$
5,327

Inertial navigation
1,920

 
349

 
3,818

 
667

Subtotal
3,363

 
2,416

 
7,482

 
5,994

Unallocated, net
(4,283
)
 
(4,217
)
 
(12,769
)
 
(13,633
)
Loss from operations
(920
)
 
(1,801
)
 
(5,287
)
 
(7,639
)
Net interest and other income (expense)
(93
)
 
(354
)
 
(455
)
 
(911
)
Loss before income tax expense
$
(1,013
)
 
$
(2,155
)
 
(5,742
)
 
$
(8,550
)

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,
 
2018
 
2017
 
2018
 
2017
Depreciation expense:
 
 
 
 
 
 
 
Mobile connectivity
$
1,842

 
$
1,339

 
$
5,212

 
$
4,212

Inertial navigation
260

 
293

 
766

 
687

Unallocated
133

 
17

 
402

 
57

Total consolidated depreciation expense
$
2,235

 
$
1,649

 
$
6,380

 
$
4,956

 
 
 
 
 
 
 
 
Amortization expense:
 
 
 
 
 
 
 
Mobile connectivity
$
958

 
$
1,096

 
$
3,101

 
$
3,266

Inertial navigation
—

 
—

 
—

 
—

Unallocated
—

 
—

 
—

 
—

Total consolidated amortization expense
$
958

 
$
1,096

 
$
3,101

 
$
3,266