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Organization and Significant Accounting Policies - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 128 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2012 | May 07, 2003
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Cash to fund operations |  | $ 59,713,424 | $ 2,931,032 | $ 19,114,444 | $ 59,713,424 | $ 3,377,288 |
Maturity description |  | less than 24 months |  |  |  |  |
Net increase (decrease) in cash |  | 40,598,980 | (446,256) |  | 59,713,424 |  |
Cash from issuance of equity | 36,000,000 | 60,000,000 |  |  |  |  |
Net cash invested in fixed income investments |  | 15,000,000 |  |  |  |  |
Cash outflow related to continuing operating activities |  | 7,000,000 |  |  |  |  |
Capital expenditures |  | 100,000 |  |  |  |  |
Restricted Cash |  | 0 | 0 |  | 0 |  |
Amount insured in FDIC per account |  | 250,000 |  |  | 250,000 |  |
Amortized cost of bonds |  | 25,750,603 |  | 10,732,414 | 25,750,603 |  |
Unrealized Loss on Securities |  | 217,216 |  | 41,643 |  |  |
Unrealized Gain on Securities |  | 0 |  | 7,500 |  |  |
Fair value of investments |  | 25,533,387 |  | 10,698,271 | 25,533,387 |  |
Minority equity investment, book value |  | 0 |  |  | 0 |  |
Minimum |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |  |  |  |
Commercial bonds |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Maturity description |  | less than 24 months |  |  |  |  |
Investments |  | 25,700,000 |  |  | 25,700,000 |  |
Warrants Issued |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |
Cash from exercise of Warrants |  | $ 2,800,000 |  |  |  |  |

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