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Prepayments, Deposits, and Other Current Assets (Details) - USD ($)
$ in Thousands
Jul. 01, 2016
Jan. 01, 2016
Prepayments, Deposits, and Other Current Assets [Line Items]    
Prepayments and deposits $ 1,493 $ 1,386
Income tax receivable 651 597
Value added tax (VAT) receivable 538 724
Royalties receivable 129 65
Deferred charges for foreign profits 182 182
Other current assets 945 682
Prepayments, deposits, and other current assets $ 3,938 $ 3,636