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Fair Value Measurement of Assets and Liabilities - Estimated Fair Values of Money Market Funds, Short-Term and Long-Term Investments (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
One year or less $ 36,345,122  
One year to two years 17,142,394  
Two years to three years 15,128,943  
Three years to four years 8,138,421  
Four years to five years 4,003,740  
More than five years     
Estimated Fair Value $ 80,758,620 $ 75,354,552