Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 29, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 0.7	$ 0.9
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	15,000,000	15,000,000
Common stock, shares issued (in shares)	9,779,147	9,779,147
Common stock, shares outstanding (in shares)	9,779,147	9,779,147