Condensed Consolidated Balance Sheets (Parenthetical) (USD $) | Sep. 24, 2011 | Dec. 31, 2010 |
|---|---|---|
| Condensed Consolidated Balance Sheets | ||
| Preferred stock, par value | $ 0.025 | $ 0.025 |
| Preferred stock, shares authorized | 5,000,000 | 5,000,000 |
| Preferred stock, shares issued | 0 | 0 |
| Preferred stock, shares outstanding | 0 | 0 |
| Common stock, par value | $ 0.025 | $ 0.025 |
| Common stock, shares authorized | 100,000,000 | 100,000,000 |
| Common stock, shares issued | 47,290,000 | 38,712,000 |
| Common stock, shares outstanding | 47,290,000 | 38,712,000 |