Prepayments, Deposits, and Other Current Assets - Schedule Of Prepayments, Deposits, and Other Current Assets (Details) - USD ($) $ in Thousands		Mar. 29, 2019	Dec. 28, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepayments and deposits		$ 2,716	$ 1,707
Prepaid insurance		1,268	1,271
Consumption tax receivable		1,007	912
Value added tax (VAT) receivable		1,089	565
Income tax receivable		319	285
BVG Prepayment		543	16
Other	[1]	592	289
Total prepayments, deposits and other current assets		$ 7,534	$ 5,045

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