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Segment Reporting (Tables)
6 Months Ended
Jun. 30, 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 expense (benefit) for the three and six months ended June 30, 2021 and 2020 were as follows:
Three Months EndedSix Months Ended
June 30,June 30,
2021202020212020
Net sales:
Mobile connectivity$33,755 $29,186 $64,262 $58,082 
Inertial navigation9,608 7,740 21,393 15,412 
     Consolidated net sales$43,363 $36,926 $85,655 $73,494 
Operating income (loss):
Mobile connectivity$580 $584 $183 $(1,715)
Inertial navigation645 154 2,735 (667)
     Subtotal1,225 738 2,918 (2,382)
Unallocated, net(7,027)(4,174)(12,327)(8,702)
     Loss from operations(5,802)(3,436)(9,409)(11,084)
Net interest and other (expense) income207 53 (367)1,864 
     Loss before income tax expense (benefit)$(5,595)$(3,383)$(9,776)$(9,220)

Depreciation expense and amortization expense for the Company's reporting segments for the three and six months ended June 30, 2021 and 2020 were as follows:
Three Months EndedSix Months Ended
June 30,June 30,
2021202020212020
Depreciation expense:
Mobile connectivity$2,779 $2,041 $5,300 $3,999 
Inertial navigation384 323 768 616 
Unallocated170 147 339 298 
     Total consolidated depreciation expense$3,333 $2,511 $6,407 $4,913 
Amortization expense:
Mobile connectivity$280 $241 $556 $489 
Inertial navigation— — — — 
Unallocated— — — — 
     Total consolidated amortization expense$280 $241 $556 $489