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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 $)
Mar. 31, 2014
Dec. 31, 2013
Assets    
Total Financial Assets $ 80,758,620 $ 75,354,552
Money Market Funds [Member]
    
Assets    
Cash and Cash Equivalents 28,530,439 19,630,109
Corporate Debt Securities [Member]
    
Assets    
Cash and Cash Equivalents 5,033 88,648
Investments 21,584,208 25,239,905
Sovereign Debt Securities [Member]
    
Assets    
Investments 30,638,940 30,395,890
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets    
Total Financial Assets 72,251,817 69,225,356
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]
    
Assets    
Cash and Cash Equivalents 28,530,439 19,630,109
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Debt Securities [Member]
    
Assets    
Cash and Cash Equivalents 5,033 88,648
Investments 13,077,405 19,110,709
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Sovereign Debt Securities [Member]
    
Assets    
Investments 30,638,940 30,395,890
Significant Other Observable Inputs (Level 2) [Member]
    
Assets    
Total Financial Assets 8,506,803 6,129,196
Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
    
Assets    
Investments $ 8,506,803 $ 6,129,196