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7. Prepaids and other current assets (Tables)
6 Months Ended
Jun. 29, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaids and other current assets
   June 29, 2019   December 29, 2018 
Prepaid insurance  $585   $271 
Prepaid rent   20     
Prepaid consulting fees   145    265 
Prepaid other   110    81 
Total prepaid expenses and other current assets  $860   $617