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Warrants and Warrant Derivative Liability - Additional Information (Detail) (USD $) | 9 Months Ended |  | 9 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 9 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Warrants Issued July 2009 | Sep. 30, 2013 Warrants Issued July 2009 | Sep. 30, 2014 Warrants Issued October 2009 | Sep. 30, 2014 Warrants Issued October 2009 Maximum | Sep. 30, 2014 Warrants Issued October 2009 Prior To Agreement | Oct. 16, 2009 October 2009 Private Placement | Oct. 16, 2009 October 2009 Private Placement Warrants issued to three former officers | Oct. 16, 2009 October 2009 Private Placement Bridge Loan | Oct. 16, 2009 October 2009 Private Placement Bridge Loan | Sep. 30, 2014 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 | Oct. 16, 2009 October 2009 Private Placement Warrants Issued October 2009 American Depositary Share | Sep. 30, 2014 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 | Oct. 16, 2009 October 2009 Private Placement Warrants Issued October 2009 Bridge Loan American Depositary Share
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding | 8,087,388 |  | 0 |  |  | 8,087,388 |  |  |  |  |  |  |  |  |  |  |  |
Exercise Price | $ 1.50 |  |  |  | $ 1.50 |  |  |  |  |  |  |  |  |  | $ 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 a warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 a pricing variability feature which provided for an increase to the exercise price if the exchange rate between the U.S. dollar and British pound adjusts such that the warrants could be exercised at a price less than the £0.5 par value of the common stock - that is, if the exchange rate exceeded U.S. $3.00 per £1.0 sterling. Due to the potential variable nature of the exercise price, the warrants are not considered to be indexed to the Company’s common stock. Accordingly, the warrants do not qualify for the exception to classify the warrants within equity and are classified as a derivative liability. |  |  |  |  |  |
Warrants issued, number of shares called by the warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,100,000 |  |
Warrants expiration date |  |  |  |  | Feb. 27, 2015 |  | Oct. 16, 2014 |  |  |  |  |  |  |  |  |  |  |
Warrants exercised |  |  | 1,684,888 | 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceed from exercise of warrants | $ 1,651,000 | $ 120,000 | $ 1,651,000 | $ 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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