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Warrants and Derivative Liability - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jan. 31, 2011
Dec. 31, 2011
Dec. 31, 2012
Oct. 31, 2009
October 2009 Private Placement
Point
Oct. 31, 2009
October 2009 Private Placement
Bridge Loan
Point
Oct. 16, 2009
October 2009 Private Placement
Bridge Loan
Dec. 31, 2012
October 2009 Private Placement
Warrants issued to three former officers
Oct. 16, 2009
October 2009 Private Placement
Warrants issued to three former officers
Dec. 31, 2012
October 2009 Private Placement
Warrants Issued October 2009
Oct. 16, 2009
October 2009 Private Placement
Warrants Issued October 2009
Dec. 31, 2012
October 2009 Private Placement
Warrants Issued October 2009
Maximum
Oct. 16, 2009
October 2009 Private Placement
Warrants Issued October 2009
American Depositary Share
Oct. 16, 2009
October 2009 Private Placement
Warrants Issued October 2009
Bridge Loan
American Depositary Share
Derivative [Line Items]                          
Number of warrant outstanding     9,936,826       600,000   7,500,000        
Exercise Price     1.44                 1.50 1.50
Common stock issued under private placement, value   $ 98,654,000   $ 70,000,000                  
Common stock issued under private placement, net proceeds       62,300,000                  
Bridge notes converted in conjunction with the private placement, amount         $ 3,600,000                
Common stock issued under private placement, shares 13,800,000     66,400,000 4,000,000                
Number of shares that each ADS represents       1 1                
Common stock issued under private placement, price per share $ 7.60     $ 1.00                  
Warrant term                       5 years 5 years
Warrants issued, number of shares called by the warrant                     36,100,000 0.5 0.5
Bridge notes converted in conjunction with the private placement, price per share           $ 0.90              
Number of warrants issued               900,000   35,200,000      
Description of pricing variability feature and classification of warrants                 The warrants issued in connection with the October 2009 financing contained apricing variability feature which provided for an increase to the exercise priceif the exchange rate between the U.S. dollar and British pound adjusts such thatthe warrants could be exercised at a price less than the 0.5 par value of thecommon stock - that is, if the exchange rate exceeded U.S. $3.00 per 1.0sterling. Due to the potential variable nature of the exercise price, thewarrants are not considered to be indexed to the Company's common stock.Accordingly, the warrants do not qualify for the exception to classify thewarrants within equity and are classified as a derivative liability.