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Fair Value Measurement of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $)
Jun. 30, 2014
Dec. 31, 2013
Assets    
Total Financial Assets $ 95,172,868 $ 75,354,552
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets    
Total Financial Assets 89,397,443 69,225,356
Significant Other Observable Inputs (Level 2) [Member]
    
Assets    
Total Financial Assets 5,775,425 6,129,196
Money Market Funds [Member]
    
Assets    
Cash and Cash Equivalents 38,994,495 19,630,109
Money Market Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets    
Cash and Cash Equivalents 38,994,495 19,630,109
Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Assets    
Cash and Cash Equivalents      
Corporate Debt Securities [Member]
    
Assets    
Cash and Cash Equivalents 24,607 88,648
Investments 21,899,049 25,239,905
Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets    
Cash and Cash Equivalents 24,607 88,648
Investments 16,123,624 19,110,709
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Assets    
Cash and Cash Equivalents      
Investments 5,775,425 6,129,196
Sovereign Debt Securities [Member]
    
Assets    
Investments 34,254,717 30,395,890
Sovereign Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets    
Investments 34,254,717 30,395,890
Sovereign Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Assets    
Investments