Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	Apr. 01, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Reserves for accounts receivable	$ 1,106	$ 1,240
Common stock, par value	$ 0.002	$ 0.002
Common stock, shares authorized	140,000	140,000
Common stock, shares issued	42,835	42,223