Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Current assets:
Allowance for doubtful accounts	$ 720	$ 699
Shareholders’ deficit:
Undesignated preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Undesignated preferred stock, shares issued (in shares)	0	0
Undesignated preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	142,500,000	142,500,000
Common stock, shares issued (in shares)	30,213,000	30,868,000
Common stock, shares outstanding (in shares)	30,213,000	30,868,000