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Restricted Cash - Additional Information (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Cash and Cash Equivalents [Line Items]    
Restricted cash $ 601,411 $ 601,351
Security Deposit Related to Credit Card Accounts [Member]
   
Cash and Cash Equivalents [Line Items]    
Restricted cash 290,000  
Standby Letters of Credit [Member]
   
Cash and Cash Equivalents [Line Items]    
Restricted cash $ 311,000