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7. Prepaids and other current assets (Details) - USD ($)
$ in Thousands
Jun. 29, 2019
Dec. 29, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid insurance $ 585 $ 271
Prepaid rent 20 0
Prepaid consulting fees 145 265
Prepaid other 110 81
Total prepaid expenses and other current assets $ 860 $ 617