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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 $)
Jun. 30, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
One year or less $ 43,582,785  
One year to two years 21,864,218  
Two years to three years 17,386,820  
Three years to four years 9,234,908  
Four years to five years 3,104,137  
More than five years     
Estimated Fair Value $ 95,172,868 $ 75,354,552