Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 27, 2013	Dec. 28, 2012
Statement Of Financial Position [Abstract]
Accounts receivable, allowance	$ 5	$ 8
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	28,694,762	27,910,851
Common stock, shares outstanding	28,694,762	27,910,851
Treasury stock, shares	601,944	601,944