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Major Category of Assets Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 32,989,522
Money market funds
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 4,812,492
U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 14,497,087
Corporate and other debt securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 13,679,943
Quoted prices in active markets for identical assets (Level 1)
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 12,608,577
Quoted prices in active markets for identical assets (Level 1) | Money market funds
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 4,812,492
Quoted prices in active markets for identical assets (Level 1) | U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 7,796,085
Significant other observable inputs (Level 2)
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 20,380,945
Significant other observable inputs (Level 2) | U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 6,701,002
Significant other observable inputs (Level 2) | Corporate and other debt securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 13,679,943