|
Investments and Fair Value Measurements (Details 2) (USD $)
|
9 Months Ended | 12 Months Ended |
|---|---|---|
|
Sep. 30, 2012
|
Dec. 31, 2011
|
|
| Summary of estimated fair value of the warrant liability | ||
| Stock price | $ 1.11 | $ 0.65 |
| Strike price | $ 2.50 | $ 2.50 |
| Remaining contractual term (years) | 3 years 3 months 18 days | 4 years 1 month 6 days |
| Volatility | 192.20% | 215.50% |
| Adjusted volatility | 125.80% | 125.50% |
| Risk-free rate | 0.40% | 0.60% |
| Dividend yield | 0.00% | 0.00% |