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Investments - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Letter of Credit [Member]
Jul. 31, 2014
Letter of Credit [Member]
Schedule of Investments [Line Items]        
Certificates of deposit   $ 30,000    
Letter of credit and related promissory note       30,000
Borrowings incurred     0  
Interest rate     1.00%  
Investment amount outstanding 0      
Investment related liability $ 0