Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Accounts receivable, allowance for doubtful accounts	$ 207	$ 146
Convertible preferred stock, par value	$ 0.01	$ 0.01
Convertible preferred stock, shares authorized	2,000,000	2,000,000
Convertible preferred stock, shares issued	0	500,000
Convertible preferred stock, shares outstanding	0	500,000
Liquidation preference, value		$ 5,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	9,899,483	8,452,971
Common stock, shares outstanding	9,899,483	8,452,971