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Principal Amount Outstanding under Loan Arrangement (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transaction [Line Items]      
Capitalization of accrued and unpaid interest due and payable $ 400 $ 300 $ 400
Mann Group
      
Related Party Transaction [Line Items]      
Principal amount outstanding at December 31, 2012 119,635    
Capitalization of accrued and unpaid interest due and payable 7,886    
Reduction of principal indebtedness related to the issuance of common stock pursuant to The Mann Group Warrants completed on October 31, 2013 (78,000)    
Principal amount outstanding at December 31, 2013 $ 49,521