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Major Category of Assets Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 28,597,527
Money Market Funds
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 3,112,314
U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 7,412,299
Corporate and other debt securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 18,072,914
Quoted prices in active markets for identical assets (Level 1)
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 5,197,435
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 3,112,314
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 2,085,121
Significant other observable inputs (Level 2)
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 23,400,092
Significant other observable inputs (Level 2) | U.S. Government and agency securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 5,327,178
Significant other observable inputs (Level 2) | Corporate and other debt securities
  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 18,072,914