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Subsequent event (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2012 | Sep. 30, 2012 | Feb. 08, 2012
Subsequent Event [Line Items] |  |  |
Interest rate (LIBOR) |  | 5.00% |
Purchase of restricted shares and restricted warrants | 40,000,000 |  |
Sale of aggregate warrant and restricted shares purchase price |  |  | $ 77.2
Common Stock Purchase | 30,000,000 | 30,000,000 |
Subsequent event (Textual) [Abstract] |  |  |
Promissory note maturity date |  | Jan. 01, 2014 |
Description of variable rate interest |  | annual interest rate on all outstanding principal to the one year London Interbank Offered Rate (LIBOR) on December 31, 2012 plus 5%, effective beginning on January 1, 2013. |
Underwritten public offering | 40,000,000 |  |
Additional common stock shares issued | 6,000,000 | 6,000,000 |
Additional Purchase Of Common Stock | 4,500,000 | 4,500,000 |
Warrant entitles the holder to purchase a share of common stock | 75.00% |  |
Rate at which warrants are exercisable | 2.60 |  | 2.40
Warrants exercisable expiration period | 53 Weeks |  |
Net proceeds from public offering | 86.0 | 86.0 |
Forecast [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Interest rate (LIBOR) |  | 5.00% |
Mann Group [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Selling price of restricted shares | $ 2.59 |  |
Sale of aggregate warrant and restricted shares purchase price | 107.4 |  |
Amended and restated promissory note outstanding principal amount | $ 350 |  |
Warrant [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Combined purchased price common stock | 2.00 |  |
Warrant [Member] | Mann Group [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Restricted warrants sale price | $ 0.125 |  |
Private Placement [Member] | Restricted Stock [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Purchase of restricted shares and restricted warrants | 40,000,000 |  |
Subsequent event (Textual) [Abstract] |  |  |
Underwritten public offering | 40,000,000 |  |
Private Placement [Member] | Warrant [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Purchase of restricted shares and restricted warrants | 40,000,000 |  |
Subsequent event (Textual) [Abstract] |  |  |
Underwritten public offering | 40,000,000 |  |

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