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10. Prepaids and other current assets (Tables)
6 Months Ended
Jun. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaids and other current assets
   June 30, 2018   December 30, 2017 
Prepaid insurance  $510   $443 
Prepaid rent   16    5 
Prepaid services   400     
Prepaid vendor draft   295     
Prepaid other   124    58 
   $1,345   $506