CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Jun. 27, 2020	Dec. 28, 2019
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	259,729	259,729
Preferred stock, outstanding shares (in shares)	259,729	259,729
Common Stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, issued shares (in shares)	1,993,578	1,919,048
Common stock, outstanding shares (in shares)	1,993,578	1,919,048