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Fair Value Measurements - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2009
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Principal amount, due date Dec. 31, 2012        
Short term liability   $ 13,900,000   $ 13,900,000  
Net present value model, discount rate   17.00%   17.00%  
Number Of trading Days   30 days   30 days  
Issuance Of common stock value For payment of stock issuance cost       1,150,000  
Interest expenses   589,000 487,000 1,176,000 977,000
Principal Amount
          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Issued note to Holdings, principal amount 15,000,000