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Segment Reporting (Tables)
6 Months Ended
Jun. 30, 2019
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, 2019 and 2018 were as follows:

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
Net sales:
 
 
 
 
 
 
 
Mobile connectivity
$
30,974

 
$
29,004

 
$
59,547

 
$
57,057

Inertial navigation
8,261

 
9,628

 
15,723

 
16,980

Consolidated net sales
$
39,235

 
$
38,632

 
$
75,270

 
$
74,037

 
 
 
 
 
 
 
 
Operating income (loss):
 
 
 
 
 
 
 
Mobile connectivity
$
(2,519
)
 
$
(243
)
 
$
(3,876
)
 
$
176

Inertial navigation
(247
)
 
1,564

 
195

 
1,898

Subtotal
(2,766
)
 
1,321

 
(3,681
)
 
2,074

Unallocated, net
(4,067
)
 
(3,901
)
 
(9,300
)
 
(8,486
)
Loss from operations
(6,833
)
 
(2,580
)
 
(12,981
)
 
(6,412
)
Net interest and other income (expense)
780

 
263

 
474

 
(306
)
Loss before income tax expense
$
(6,053
)
 
$
(2,317
)
 
$
(12,507
)
 
$
(6,718
)

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,
 
2019
 
2018
 
2019
 
2018
Depreciation expense:
 
 
 
 
 
 
 
Mobile connectivity
$
1,669

 
$
1,346

 
$
3,339

 
$
2,481

Inertial navigation
307

 
254

 
594

 
506

Unallocated
138

 
128

 
274

 
269

Total consolidated depreciation expense
$
2,114

 
$
1,728

 
$
4,207

 
$
3,256

 
 
 
 
 
 
 
 
Amortization expense:
 
 
 
 
 
 
 
Mobile connectivity
$
247

 
$
257

 
$
495

 
$
518

Inertial navigation

 

 

 

Unallocated

 

 

 

Total consolidated amortization expense
$
247

 
$
257

 
$
495

 
$
518