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Segment Reporting (Tables)
6 Months Ended
Jun. 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 expense (benefit) for the three and six months ended June 30, 2020 and 2019 were as follows:

Three Months EndedSix Months Ended
June 30,June 30,
2020201920202019
Net sales:
Mobile connectivity$29,186  $31,469  $58,082  $60,383  
Inertial navigation7,740  8,261  15,412  15,723  
     Consolidated net sales$36,926  $39,730  $73,494  $76,106  
Operating income (loss):
Mobile connectivity$584  $(2,365) $(1,715) $(3,808) 
Inertial navigation154  (247) (667) 195  
     Subtotal738  (2,612) (2,382) (3,613) 
Unallocated, net(4,174) (4,067) (8,702) (9,300) 
     Loss from operations(3,436) (6,679) (11,084) (12,913) 
Net interest and other income53  781  1,864  474  
     Loss from continuing operations before income tax expense (benefit)$(3,383) $(5,898) $(9,220) $(12,439) 

Depreciation expense and amortization expense for the Company's reporting segments for the three and six months ended June 30, 2020 and 2019 were as follows:

Three Months EndedSix Months Ended
June 30,June 30,
2020201920202019
Depreciation expense:
Mobile connectivity$2,041  $1,669  $3,999  $3,339  
Inertial navigation323  307  616  594  
Unallocated147  138  298  274  
     Total consolidated depreciation expense$2,511  $2,114  $4,913  $4,207  
Amortization expense:
Mobile connectivity$241  $247  $489  $495  
Inertial navigation—  —  —  —  
Unallocated—  —  —  —  
     Total consolidated amortization expense$241  $247  $489  $495