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Common and preferred stock (Details Textual) (USD $)
 6 Months Ended 256 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 27, 2012
May 17, 2012
Mar. 31, 2012
Feb. 08, 2012
Dec. 31, 2011
Jun. 30, 2012
Senior convertible notes due 2015 [Member]
Dec. 31, 2011
Senior convertible notes due 2015 [Member]
Aug. 31, 2010
Senior convertible notes due 2015 [Member]
May 17, 2012
Other Than Equity [Member]
Jun. 30, 2012
Warrant Liability [Member]
Feb. 08, 2012
Warrant Liability [Member]
Jun. 30, 2012
Mann Group [Member]
Mar. 31, 2012
Mann Group [Member]
Forward Purchase Contracts [Member]
May 17, 2012
Mann Group [Member]
Forward Purchase Contracts [Member]
Jun. 30, 2012
Mann Group [Member]
Forward Purchase Contracts [Member]
Equity Component [Member]
Jun. 30, 2012
Mann Group [Member]
Forward Purchase Contracts [Member]
Other Than Equity [Member]
Mar. 31, 2012
Mann Group [Member]
Forward Purchase Contracts [Member]
Other Than Equity [Member]
Feb. 08, 2012
Underwriters [Member]
Feb. 08, 2012
Public [Member]
Class of Stock [Line Items]                                            
Principal amount                 $ 100,000,000 $ 100,000,000 $ 100,000,000                      
Senior notes, effective interest rate                 5.75%   5.75%                      
Number of Unit Sold in an Underwritten public offering             35,937,500                           4,687,500  
Purchased Price of the units by underwriters                                         2.256 2.40
Number of warrants are exercisable             21,562,500             21,562,500                
Rate at which warrants are exercisable             2.40             2.40                
Duration for Expiration of warrants                         4 years                  
Authorized shares under common stock purchase agreement                             250,000,000              
Proposal to increase the authorized share 350,000,000   350,000,000         250,000,000             350,000,000              
Number of Shares that recorded the portion of the derivative instrument representing equity                                   14,700,000        
Fair value of the forward purchase contract                               2,000,000   900,000 1,100,000      
Other Expenses                               300,000            
Risk Free Interest Rate         0.0018 0.0059                            0.0008    
Discount for lack of marketability         0.0167                        0.1027          
Capital stock authorized 131,522,945   131,522,945 31,250,000       131,522,945             31,250,000              
Fair value of Non-Equity Portion                       13,100,000                    
Related Party Transaction [Line Items]                                            
Common stock, shares issued 199,300,833   199,300,833         199,300,833                            
Common and Preferred Stock (Textual) [Abstract]                                            
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 80,992,000 10,424,000 1,311,013,000                                      
Restricted Stock Agreed to be Purchased by Lender             77,200,000                              
Undesignated preferred stock, par value $ 0.01   $ 0.01         $ 0.01                            
Capital stock authorized 0   0                                      
Capital stock authorized 131,522,945   131,522,945 31,250,000       131,522,945             31,250,000              
Common stock loaned under share lending agreement, shares 9,000,000   9,000,000                                      
Time required for returning shares after payment of entire debt 45 days                                          
Nominal lending fee $ 0.01                                          
Derivative Portion Balance in Current Assets           800,000                                
change in fair value recongized in other income $ 12,000,000   $ 12,000,000                                      
Number of Shares that recorded the portion of the derivative instrument representing outside of equity           16,700,000                                
Valuation of non-equity portion of forward contract         $ 1.69   $ 2.40