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Other Non-Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Other Assets, Longterm [Abstract]    
Deferred revenue, long-term $ 747 $ 237
Prepaid deposits 2,619 3,286
Long term investments 1,515 1,234
Restricted cash(1) 147 148
Other non-current assets $ 4,281 $ 4,668