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Warrant Liabilities (Schedule of Warrant Liabilities at Fair Value) (Details) (USD $)
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6 Months Ended | 6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
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Mar. 31, 2012
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Sep. 30, 2012
Warrant [Member]
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May 31, 2011
Warrant [Member]
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Sep. 30, 2012
Bridge Warrant [Member]
Warrant [Member]
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Sep. 30, 2012
Bridge Warrant Placement Agent [Member]
Warrant [Member]
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Sep. 30, 2012
Unit Offerings [Member]
Warrant [Member]
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Sep. 30, 2012
Unit Offerings Placement Agent Member
Warrant [Member]
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Sep. 30, 2012
2012 Bridge Warrant [Member]
Warrant [Member]
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Sep. 30, 2012
2012 Bridge Placement Agent Warrant [Member]
Warrant [Member]
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| 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 | |