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Warrant Liability (Details 3) (USD $)
 3 Months Ended
Jun. 30, 2012
Summary of changes in fair value of warrant liability  
Number of warrants, ending balance 12,134,483
Series A Warrant [Member]
  
Summary of changes in fair value of warrant liability  
Number of warrants, beginning balance 8,900,000
Fair Value of warrant liability, beginning balance $ 6,234,984
Number of warrants issued 1,800,000
Fair value of warrants issued 1,106,618
Number of warrants, changes in fair value at period end   
Fair value, changes in fair value at period end (1,951,584)
Fair Value of warrant liability, ending balance 5,390,018
Number of warrants, ending balance 10,700,000
Series B Warrant [Member]
  
Summary of changes in fair value of warrant liability  
Number of warrants, beginning balance 7,100,000
Fair Value of warrant liability, beginning balance 4,769,140
Number of warrants exercised (1,800,000)
Fair value of warrants exercised (527,799)
Fair Value of warrants expired (3,560,063)
Number of warrants expired (5,300,000)
Number of warrants, changes in fair value at period end   
Fair value, changes in fair value at period end (681,278)
Fair Value of warrant liability, ending balance   
Number of warrants, ending balance