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Major Category of Assets Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 34,049,823
Money Market Funds
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 9,188,883
U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 5,681,927
Corporate and other debt securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 19,179,013
Quoted prices in active markets for identical assets (Level 1)
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 11,736,861
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 9,188,883
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 2,547,978
Significant other observable inputs (Level 2)
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 22,312,962
Significant other observable inputs (Level 2) | U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 3,133,949
Significant other observable inputs (Level 2) | Corporate and other debt securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 19,179,013