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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. |  |  |  |

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- Definition The exercise price of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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- Definition The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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