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Warrants and Warrant Derivative Liability - Additional Information (Detail) (USD $) | 3 Months Ended | 1 Months Ended |  |  | 1 Months Ended |  | 3 Months Ended |  |  |
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Warrants Issued July 2009 | Oct. 31, 2009 October 2009 Private Placement Point | Mar. 31, 2013 October 2009 Private Placement Warrants issued to three former officers | Oct. 16, 2009 October 2009 Private Placement Warrants issued to three former officers | Oct. 31, 2009 October 2009 Private Placement Bridge Loan Point | Oct. 16, 2009 October 2009 Private Placement Bridge Loan | Mar. 31, 2013 October 2009 Private Placement Warrants Issued October 2009 | Oct. 16, 2009 October 2009 Private Placement Warrants Issued October 2009 | Oct. 16, 2009 October 2009 Private Placement Warrants Issued October 2009 American Depositary Share | Mar. 31, 2013 October 2009 Private Placement Warrants Issued October 2009 Maximum | Oct. 16, 2009 October 2009 Private Placement Warrants Issued October 2009 Bridge Loan American Depositary Share
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrant outstanding | 9,866,826 |  |  |  | 600,000 |  |  |  | 7,500,000 |  |  |  |
Exercise Price | 1.44 |  |  |  |  |  |  |  |  |  | 1.50 |  | 1.50
Common stock issued under private placement, value |  |  |  | $ 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 |  |  |  | 66,400,000 |  |  | 4,000,000 |  |  |  |  |  |
Number of shares that each ADS represents |  |  |  | 1 |  |  | 1 |  |  |  |  |  |
Common stock issued under private placement, price per share |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |
Warrant term |  |  |  |  |  |  |  |  |  |  | 5 years |  | 5 years
Warrants issued, number of shares called by the warrant |  |  |  |  |  |  |  |  |  |  | 0.5 | 36,100,000 | 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. |  |  |  |
Warrants exercised |  |  | 70,000 |  |  |  |  |  |  |  |  |  |
Proceed from exercise of warrants | $ 70,000 | $ 59,000 | $ 100,000 |  |  |  |  |  |  |  |  |  |

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