Prepayments, Deposits, and Other Current Assets - Schedule Of Prepayments, Deposits, and Other Current Assets (Details) - USD ($) $ in Thousands		Jun. 28, 2019	Dec. 28, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepayments and deposits		$ 2,953	$ 1,707
Prepaid insurance		928	1,271
Consumption tax receivable		284	912
Value added tax (VAT) receivable		1,078	565
Income tax receivable		295	285
BVG Prepayment		372	16
Other	[1]	457	289
Total prepayments, deposits and other current assets		$ 6,367	$ 5,045

[1] No individual item in “other current assets” exceeds 5% of the total prepayments, deposits and other current assets.