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Segment Reporting (Tables)
3 Months Ended
Mar. 31, 2022
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 (benefit) for the three months ended March 31, 2022 and 2021 were as follows:
Three Months Ended
March 31,
20222021
Net sales:
Mobile connectivity$33,151 $30,507 
Inertial navigation7,943 11,785 
     Consolidated net sales$41,094 $42,292 
Operating income (loss):
Mobile connectivity$1,305 $(397)
Inertial navigation(460)2,090 
     Subtotal845 1,693 
Unallocated, net(5,553)(5,300)
     Loss from operations(4,708)(3,607)
Net interest and other income (expense), net345 (574)
     Loss before income tax expense (benefit)$(4,363)$(4,181)

Depreciation expense and amortization expense for the Company's reporting segments for the three months ended March 31, 2022 and 2021 were as follows:
Three Months Ended
March 31,
20222021
Depreciation expense:
Mobile connectivity$2,892 $2,521 
Inertial navigation308 384 
Unallocated173 169 
     Total consolidated depreciation expense$3,373 $3,074 
Amortization expense:
Mobile connectivity$194 $276 
Inertial navigation— — 
Unallocated— — 
     Total consolidated amortization expense$194 $276