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Major Category of Assets Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 27,557,727
Money Market Funds
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 4,205,258
U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 13,344,360
Corporate and other debt securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 10,008,109
Fair Value, Inputs, Level 1
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 6,789,775
Fair Value, Inputs, Level 1 | Money Market Funds
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 4,205,258
Fair Value, Inputs, Level 1 | U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 2,584,517
Fair Value, Inputs, Level 2
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 20,767,952
Fair Value, Inputs, Level 2 | U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 10,759,843
Fair Value, Inputs, Level 2 | Corporate and other debt securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 10,008,109