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10. Prepaids and other current assets (Tables)
9 Months Ended
Sep. 29, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaids and other current assets
    September 29, 2018     December 30, 2017  
Deposits     568       411  
Other     100       107  
    $ 668     $ 518