|
Note 4. Equity Incentive Plan and Stock-Based Compensation (Detail) - Weighted Average Fair Value of Stock Options Granted
|
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2012
|
Sep. 25, 2011
|
Sep. 30, 2012
|
Sep. 25, 2011
|
|
| Expected volatility | 51.24% | 57.79% | 51.23% | 57.02% |
| Risk-free interest rate | 0.50% | 0.69% | 0.67% | 1.08% |
| Expected term (in years) | 4 years 127 days | 4 years 127 days | 4 years 127 days | 4 years 127 days |
| Dividend yield | 0.00% | 0.00% | 0.00% | 0.00% |