|
Assumptions Used to Estimate Weighted Average Fair Value of Options Using Black-Scholes Option-Pricing Model (Detail)
|
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 25, 2011
|
Jun. 30, 2012
|
Jun. 25, 2011
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Risk-free interest rate | 0.79% | 0.76% | 0.82% | 0.76% |
| Expected volatility | 124.41% | 114.23% | 114.69% | 114.23% |
| Weighted average expected life (in years) | 5 years 3 months 22 days | 5 years 3 months 7 days | 6 years 7 months 13 days | 5 years 3 months 7 days |
| Expected dividends | 0.00% | 0.00% | 0.00% | 0.00% |