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Common and Preferred Stock - Additional Information (Detail) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Senior convertible notes due August 15, 2015
Dec. 31, 2013
Senior convertible notes due August 15, 2015
Aug. 18, 2010
Senior convertible notes due August 15, 2015
Mar. 31, 2014
Senior convertible notes due December 31, 2019
Feb. 28, 2014
Deerfield
Senior convertible notes due December 31, 2019
Jun. 30, 2013
Deerfield
Senior convertible notes due December 31, 2019
Notes Issued in Four Equal Tranches
Tranche
Mar. 31, 2014
Deerfield
Senior convertible notes due December 31, 2019
Notes Issued in Four Equal Tranches
Class of Stock [Line Items]                  
Common stock, shares authorized 550,000,000 550,000,000              
Common stock, par value $ 0.01 $ 0.01              
Undesignated preferred stock, shares authorized 10,000,000                
Undesignated preferred stock, par value $ 0.01 $ 0.01              
Common stock, shares issued 386,934,914 369,391,972              
Common stock, shares outstanding 386,934,914 369,391,972              
Common stock loaned under share lending agreement, shares 9,000,000 9,000,000              
Principal amount     $ 100,000,000 $ 100,000,000 $ 100,000,000 $ 120,000,000   $ 160,000,000 $ 120,000,000
Nominal lending fee $ 0.01                
Maximum sales amount under the agreement               160,000,000  
Number of equal tranches               4  
Debt facility periodic principal amount               40,000,000  
Aggregate principal amount of convertible notes             $ 60,000,000    
Common shares issuable upon conversion             12,000,000    
Conversion price of shares         $ 6.80   $ 5.00