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Balance sheet information - Cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Jul. 03, 2021
Dec. 31, 2020
Jun. 27, 2020
Dec. 31, 2019
Cash and cash equivalents $ 136,065 $ 86,839    
Restricted cash 2,003 0    
Cash, cash equivalents, and restricted cash $ 138,068 $ 86,839 $ 126,240 $ 64,520