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Symphony Dynamo, Inc. - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
May 09, 2012
Nov. 03, 2011
Nov. 02, 2010
Apr. 30, 2010
Apr. 16, 2010
Nov. 30, 2009
Apr. 30, 2007
Apr. 18, 2006
Jun. 30, 2010
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2009
Jun. 30, 2010
Warrant Liability
Apr. 18, 2006
Maximum
Dec. 31, 2012
SDI
Apr. 18, 2006
SDI
Apr. 18, 2006
Holdings
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                                  
Investments in SDI                               $ 50,000,000  
Ownership percentage by parent                               100.00% 100.00%
Warrants issued to purchase common stock       7,038,210   2,000,000               2,000,000      
Warrants exercisable period       5 years 5 years 5 years   5 years                  
Warrants exercise price       $ 1.50 $ 1.50 $ 1.94   $ 7.32                  
Warrant exercised             15,000,000                    
Common stock issue on acquisition           13,000,000                      
Issued note to Holdings, principal amount           15,000,000                      
Principal amount, due date           Dec. 31, 2012                      
Business acquisition contingent consideration percentage           50.00%                      
Business acquisition upfront payment           50,000,000                      
Net present value model, discount rate                   17.00%              
Repayment of note payable                   15,000,000              
Stock issued during period, shares 17,500,000 27,600,000 26,450,000 1,076,420             900,860 1,281,100          
Non operating income expense                 11,100,000                
Changes in warrant liability                         9,500,000        
Increase in additional paid in capital                         1,600,000        
Reclassification of warranty liability into equity                         $ 12,000,000        
Warrants outstanding                   10,913,873         6,765,128