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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 29, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Accounts receivable, net of allowance for doubtful accounts of $1,079 and $1,254 as of September 29, 2019 and December 31, 2018, respectively $ 1,079 $ 1,254