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Major Category of Assets Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 27,993,814
Money Market Funds
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 3,598,743
U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 8,655,678
Corporate and other debt securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 15,679,393
Quoted prices in active markets for identical assets (Level 1)
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 4,800,962
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 3,598,743
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 1,202,219
Significant other observable inputs (Level 2)
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 23,132,852
Significant other observable inputs (Level 2) | U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 7,453,459
Significant other observable inputs (Level 2) | Corporate and other debt securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 15,679,393