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Organization and Significant Accounting Policies - Additional Information (Detail) (USD $)
 1 Months Ended 6 Months Ended 12 Months Ended 131 Months Ended
May 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Sep. 30, 2013
Mar. 31, 2014
Sep. 30, 2012
Schedule Of Investments [Line Items]            
Cash to fund operations   $ 142,847,860 $ 3,313,483 $ 19,114,444 $ 142,847,860 $ 3,377,288
Maturity description   Less than 30 months        
Net increase (decrease) in cash   123,733,416 (63,805)   142,847,860  
Cash from issuance of equity 36,000,000 172,600,000        
Net cash invested in fixed income investments   41,400,000        
Cash outflow related to continuing operating activities   14,700,000        
Capital expenditures   600,000        
Restricted Cash   0 0   0  
Amount insured in FDIC per account   250,000     250,000  
Amortized cost of bonds   51,846,834   10,732,414 51,846,834  
Unrealized Loss on Securities   283,376   41,643    
Unrealized Gain on Securities   0   7,500    
Fair value of investments   51,563,458   10,698,271 51,563,458  
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 30 months        
Investments   51,800,000     51,800,000  
Warrants Issued
            
Schedule Of Investments [Line Items]            
Cash from exercise of Warrants   $ 8,000,000