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Fair Value of Warrant Liability (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | ||
|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2012
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Dec. 31, 2012
Warrants Issued Prior To September 30, 2012
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Sep. 30, 2012
Warrants Issued Prior To September 30, 2012
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Dec. 31, 2012
Warrants Issued From October 1 - December 31, 2012
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| Fair Value Of Warrant Liability [Line Items] | |||||
| Balance at Issuance | $ 3,728,512 | $ 3,788,687 | $ 1,552,124 | ||
| Warrant exercised in the quarter ended September 30, 2012 | 0 | 0 | 0 | ||
| Change in fair value in the quarter ended September 30, 2012 | (60,176) | (346,627) | 293,936 | (60,176) | 112,867 |
| Balance at September 30, 2012 | $ 5,687,438 | $ 5,687,438 | $ 4,022,447 | $ 3,728,512 | $ 1,664,991 |