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Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 9 Months Ended 1 Months Ended 2 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Jul. 12, 2013
Sep. 30, 2013
Sep. 30, 2012
Jan. 31, 2013
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Feb. 29, 2012
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Sep. 30, 2013
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Sep. 30, 2013
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Group 1
Sep. 30, 2013
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Group 2
Sep. 30, 2013
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Group 3
Sep. 30, 2012
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Group 3
Sep. 30, 2013
Stock Incentive Plan 2011
Deferred Stock Units (DSUs)
Sep. 30, 2013
Stock Incentive Plan 2011
Deferred Stock Units (DSUs)
Jul. 12, 2013
American Depository Shares
Stockholders Equity Note [Line Items]                          
ADS issued in public offering, number                         21,700,000
ADS issued in public offering, price per ADS                         $ 5.60
ADS issued in public offering, net proceeds $ 121.2                       $ 121.2
Options granted for purchase of additional shares                         3,255,000
Option,exercisable period                         30 days
Shares issued, exercise of stock options   386,000 3,107,913                    
Gross proceeds from exercise of stock options   0.6 7.9                    
Net proceeds from exercise of stock options   0.6 7.8                    
Shares issued, exercise of warrants   120,000 10,881,276                    
Gross proceeds from exercise of warrants   0.1 16.6                    
Net proceeds from exercise of warrants   0.1 16.5                    
Stock units granted       454,875 584,400 44,000         54,000    
Stock units, Expiration date       Aug. 03, 2015   Dec. 31, 2013              
Stock units, forfeited             0 32,500 90,684     0  
Restricted stock units,issued as a result of vesting             0 0 93,048 97,398      
Restricted Stock units, Expenses             0 0 0.3 1.2      
Stock units,Vesting Period                       3 years  
Deferred Stock units, Expenses                       $ 47,000  
Deferred Stock units, issued as a result of vesting                       0