Quarterly report pursuant to Section 13 or 15(d)

13. Deposits and other assets (Details)

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13. Deposits and other assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Assets, Noncurrent [Abstract]    
Deposits $ 408 $ 411
Other 100 107
Total other assets $ 508 $ 518