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Organization and Basis of Presentation - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 122 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 31, 2013 | Jan. 31, 2013 | Dec. 31, 2012 | Aug. 10, 2012 | Jun. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Sep. 30, 2012 | Jun. 30, 2013 | Sep. 30, 2011
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Cash for fund operations |  |  |  |  | $ 29,025,930 | $ 29,025,930 | $ 2,282,641 | $ 3,377,288 | $ 29,025,930 | $ 7,507,389
Net increase decrease in cash |  |  |  |  |  | 25,648,642 | (5,224,748) |  | 29,025,930 |
Cash from issuance of equity | 36,000,000 | 3,300,000 | 3,800,000 |  | 1,200,000 | 42,400,000 |  |  |  |
Other cash collections |  |  |  |  |  | 1,600,000 |  |  |  |
Cash outflow from continuing operations |  |  |  |  |  | (13,639,360) | (10,752,290) |  | (89,517,156) |
Drawing Limit under Equity Line Facility |  |  |  |  |  |  |  |  |  | 15,000,000
Minimum stock price required to maintain under equity line facility |  |  |  |  |  |  |  |  |  | $ 2.00
Proceeds from equity line facility |  |  |  |  |  |  |  | 1,000,000 |  |
Shares issued under public offering |  | 1,667,051 | 1,800,000.0 |  | 1,170,000 |  |  |  |  |
Shares issued under public offering, price per share |  | $ 2.12 | $ 2.26 |  |  |  |  |  |  |
Unit sold, description |  | Each unit consisted of one share of Common Stock and a warrant to purchase | Each unit consisted of one share of Common Stock and a warrant to purchase |  |  |  |  |  |  |
Warrant to purchase share of Common Stock |  | 0.5 | 0.5 |  |  |  |  |  |  |
Exercise price of warrant |  | 1.83 |  |  | 1.83 | 1.83 |  |  | 1.83 |
Issuance and sold of stock | 14,300,000.0 |  |  | 2,260,869 |  |  |  |  |  |
Sale of stock, price per share | $ 1.83 |  |  | $ 2.76 |  |  |  |  |  |
Proceeds from issuance of common stock and warrants, net | 35,400,000 | 3,500,000 |  | 6,200,000 |  | 42,448,824 | 5,401,392 |  | 148,701,835 |
Reverse stock split |  |  |  |  |  | 0.1 |  |  |  |
Short term investments |  |  |  |  | 4,058,003 | 4,058,003 |  | 106,500 | 4,058,003 |
Gross unrealized losses |  |  |  |  |  | 17,208 |  |  |  |
Fair value of investments |  |  |  |  | 4,040,795 | 4,040,795 |  |  | 4,040,795 |
Gross unrealized gains |  |  |  |  |  | $ 0 |  |  |  |
Series B convertible preferred stock |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance and sold of stock | 9,900 |  |  |  |  |  |  |  |  |
Sale of stock, price per share | $ 1,000 |  |  |  |  |  |  |  |  |
Conversion price | $ 1.83 |  |  |  |  |  |  |  |  |
Warrants Issued |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrant |  |  |  |  | 1.83 | 1.83 |  |  | 1.83 |

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