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Common and Preferred Stock - Additional Information (Detail) (USD $) | 1 Months Ended | 6 Months Ended | 268 Months Ended |  |  |  | 6 Months Ended |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2012 | Feb. 28, 2012 | Jun. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Feb. 28, 2012 Warrant Liability | Feb. 28, 2012 Related Party | Jun. 30, 2013 Mann Group | Oct. 31, 2012 Mann Group | Oct. 31, 2012 Mann Group Private Placement | Jun. 30, 2013 Senior convertible notes due August 15 2015 | Dec. 31, 2012 Senior convertible notes due August 15 2015 | Aug. 18, 2010 Senior convertible notes due August 15 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 550,000,000 | 550,000,000 | 550,000,000 |  |  |  |  |  |  |  |  |
Common stock, par value |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |
Undesignated preferred stock, shares authorized |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  | 300,869,683 | 300,869,683 | 286,035,082 |  |  |  |  |  |  |  |  |
Capital stock authorized |  | 31,250,000 | 300,869,683 | 300,869,683 | 286,035,082 | 31,250,000 |  |  | 31,250,000 |  |  |  |  |
Common stock loaned under share lending agreement, shares |  |  | 9,000,000 | 9,000,000 | 9,000,000 |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 100,000,000 | $ 100,000,000
Nominal lending fee |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Number of Unit Sold in an Underwritten public offering |  | 35,937,500 |  |  |  |  |  |  |  |  |  |  |  |
Underwritten public offering |  | 86,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Units sold composition description |  |  |  |  |  |  |  | Each unit consisting of one share of common stock and a warrant to purchase 0.6 of a share of common stock |  |  |  |  |  |
Warrant to purchase of a share of common stock |  | 0.6 |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from offering |  |  | 80,600,000 |  |  |  |  |  |  |  |  |  |  |
Rate at which warrants are exercisable | 2.60 |  |  |  |  |  | 2.40 |  |  |  |  |  |  |
Warrant expiration date |  | 2016-02 |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Agreed to be Purchased by Lender |  | 77,200,000 |  |  |  |  |  |  | 78,000,000 | 107,400,000 |  |  |  |
Underwritten public offering | 46,000,000 |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  |
Net proceeds from public offering | 92,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares in each units issued | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant entitles the holder to purchase a share of common stock | 0.75 |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from public offering | 86,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant expiration date | Fourth quarter of 2013 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock purchase |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |
Proceeds from exercise of warrants |  |  | 28,308,000 | 28,308,000 |  |  |  |  | 25,100,000 |  |  |  |  |
Warrants remained unexercised |  |  | $ 64,600,000 | $ 64,600,000 |  |  |  |  | $ 64,600,000 |  |  |  |  |

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