v2.4.0.6
Warrant Liabilities (Schedule of Warrant Liabilities at Fair Value) (Details) (USD $)
6 Months Ended 6 Months Ended
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2012
Warrant [Member]
May 31, 2011
Warrant [Member]
Sep. 30, 2012
Bridge Warrant [Member]
Warrant [Member]
Sep. 30, 2012
Bridge Warrant Placement Agent [Member]
Warrant [Member]
Sep. 30, 2012
Unit Offerings [Member]
Warrant [Member]
Sep. 30, 2012
Unit Offerings Placement Agent Member
Warrant [Member]
Sep. 30, 2012
2012 Bridge Warrant [Member]
Warrant [Member]
Sep. 30, 2012
2012 Bridge Placement Agent Warrant [Member]
Warrant [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                    
Number of shares underlying the warrants   34,165,965     8,789,064 1,165,875 19,800,313 3,125,000 1,071,428 214,285
Beginning balance $ 25,797,615   $ 32,880,252 $ 27,797,615 $ 6,604,706 $ 876,119 $ 15,816,980 $ 2,499,810      
Initial measurement of warrants 860,112                   716,760 143,352
Increase in fair value (5,429,786)       (1,625,276) (215,594) (3,042,276) (476,723) (58,264) (11,653)
Ending balance $ 21,227,942   $ 32,880,252 $ 27,797,615 $ 4,979,430 $ 660,525 $ 12,774,704 $ 2,023,088 $ 658,496 $ 131,699