Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Statement of Financial Position [Abstract]
Allowances for doubtful accounts	$ 253	$ 293
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	47,000,000	47,000,000
Common stock, shares issued	24,156,554	23,537,275
Common stock, shares outstanding	24,156,554	23,537,275