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12. Intangible assets (Tables)
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets
    March 31,
2018
    December 30,
2017
 
Intangible assets GeoTraq, net   $ 23,766     $ 24,699  
Patent     19       19  
    $ 23,785     $ 24,718