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Derivative Financial Instruments (Details 5) (Binomial Lattice Technique [Member], USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Level 1 [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Linked common shares | 1,800,000 | 1,800,000 | 1,800,000
Quoted market price on valuation date | $ 3.725 | $ 3.13 | $ 2.74
Contractual exercise rate | 250.00% | 250.00% | 250.00%
Trem (years) | 1 year 3 months 11 days | 2 years 3 months 11 days | 1 year 9 months 11 days
Level 1 [Member] | Minimum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 48.70% | 61.00% | 56.80%
Risk free rates using zero coupon US Treasury | 0.04% | 0.03% | 0.02%
Level 1 [Member] | Maximum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 73.10% | 72.80% | 101.60%
Risk free rates using zero coupon US Treasury | 0.27% | 0.81% | 0.25%
Level 2 [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Linked common shares | 525,000 | 525,000 | 525,000
Quoted market price on valuation date | $ 3.725 | $ 3.13 | $ 2.74
Contractual exercise rate | 275.00% | 250.00% | 275.00%
Trem (years) | 1 year 9 months 15 days | 2 years 3 months 11 days | 2 years 3 months 11 days
Level 2 [Member] | Minimum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 48.90% | 61.00% | 56.90%
Risk free rates using zero coupon US Treasury | 0.04% | 0.03% | 0.02%
Level 2 [Member] | Maximum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 72.20% | 72.80% | 94.00%
Risk free rates using zero coupon US Treasury | 0.27% | 0.81% | 0.25%
Level 3 [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Linked common shares | 1,562,500 |  | 1,302,083
Quoted market price on valuation date | $ 3.725 |  | $ 2.74
Contractual exercise rate | 360.00% |  | 432.00%
Trem (years) | 4 years 10 months 10 days |  | 5 years 4 months 6 days
Custom lattice variable: Probability of exercisability (434,027 linked common shares) |  |  | 60.00%
Level 3 [Member] | Minimum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 48.80% |  | 67.20%
Risk free rates using zero coupon US Treasury | 0.09% |  | 0.02%
Level 3 [Member] | Maximum [Member] |  |  |
Significant assumptions utilized in valuation technique |  |  |
Range of market volatilities | 72.50% |  | 87.50%
Risk free rates using zero coupon US Treasury | 0.72% |  | 0.83%

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- Definition Derivative financial instruments fair value assumptions linked common shares. + References No definition available. + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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