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Segment Reporting (Tables)
3 Months Ended
Mar. 31, 2021
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 months ended March 31, 2021 and 2020 were as follows:

Three Months Ended
March 31,
20212020
Net sales:
Mobile connectivity$30,507 $28,896 
Inertial navigation11,785 7,672 
     Consolidated net sales$42,292 $36,568 
Operating (loss) income:
Mobile connectivity$(397)$(2,299)
Inertial navigation2,090 (821)
     Subtotal1,693 (3,120)
Unallocated, net(5,300)(4,528)
     Loss from operations(3,607)(7,648)
Net interest and other (expense) income(574)1,811 
     Loss before income tax (benefit) expense $(4,181)$(5,837)
Depreciation expense and amortization expense for the Company's reporting segments for the three months ended March 31, 2021 and 2020 were as follows:

Three Months Ended
March 31,
20212020
Depreciation expense:
Mobile connectivity$2,521 $1,958 
Inertial navigation384 293 
Unallocated169 151 
     Total consolidated depreciation expense$3,074 $2,402 
Amortization expense:
Mobile connectivity$276 $248 
Inertial navigation— — 
Unallocated— — 
     Total consolidated amortization expense$276 $248