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Fair Value of Financial Instruments - Summary of Fair Value Measurement Financial Asset and Liabilities (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Assets:    
Cash and cash equivalents $ 172,675,086 $ 90,434,435
Money market funds 26,046,730 26,046,974
Restricted cash 404,850 404,850
Total Assets 199,126,666 116,886,259
Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
    
Assets:    
Cash and cash equivalents 172,675,086 90,434,435
Money market funds 26,046,730 26,046,974
Restricted cash 404,850 404,850
Total Assets 199,126,666 116,886,259
Significant Other Observable Inputs Level 2 [Member]
    
Assets:    
Cash and cash equivalents      
Money market funds      
Restricted cash      
Total Assets      
Significant Unobservable Inputs Level 3 [Member]
    
Assets:    
Cash and cash equivalents      
Money market funds      
Restricted cash      
Total Assets