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Segment Reporting (Tables)
9 Months Ended
Sep. 30, 2020
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 (benefit) expense for the three and nine months ended September 30, 2020 and 2019 were as follows:

Three Months EndedNine Months Ended
September 30,September 30,
2020201920202019
Net sales:
Mobile connectivity$31,383 $31,642 $89,465 $92,025 
Inertial navigation9,729 7,669 25,141 23,392 
     Consolidated net sales$41,112 $39,311 $114,606 $115,417 
Operating income (loss):
Mobile connectivity$2,285 $(267)$570 $(4,075)
Inertial navigation1,408 (171)741 24 
     Subtotal3,693 (438)1,311 (4,051)
Unallocated, net(4,196)(4,420)(12,898)(13,720)
     Loss from operations(503)(4,858)(11,587)(17,771)
Net interest and other (expense) income(143)1,058 1,721 1,532 
     Loss from continuing operations before income tax (benefit) expense $(646)$(3,800)$(9,866)$(16,239)
Depreciation expense and amortization expense for the Company's reporting segments for the three and nine months ended September 30, 2020 and 2019 were as follows:

Three Months EndedNine Months Ended
September 30,September 30,
2020201920202019
Depreciation expense:
Mobile connectivity$2,160 $1,824 $6,159 $5,163 
Inertial navigation318 280 934 874 
Unallocated146 142 444 416 
     Total consolidated depreciation expense$2,624 $2,246 $7,537 $6,453 
Amortization expense:
Mobile connectivity$251 $237 $740 $732 
Inertial navigation— — — — 
Unallocated— — — — 
     Total consolidated amortization expense$251 $237 $740 $732