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Equity - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 2 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Stock Incentive Plan 2011
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)
Dec. 31, 2013
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Group 3
Dec. 31, 2012
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Group 3
Dec. 31, 2013
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Group 1
Dec. 31, 2013
Stock Incentive Plan 2011
Restricted Stock Units (RSUs)
Group 2
Dec. 31, 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                         $ 121,200,000
Options granted for purchase of additional shares                         3,255,000
Option, exercisable period                         30 days
Shares issued, exercise of stock options 386,000 3,380,413                      
Gross proceeds from exercise of stock options 600,000 8,200,000                      
Net proceeds from exercise of stock options 600,000 8,200,000                      
Shares issued, exercise of warrants 147,050 11,047,579                      
Gross proceeds from exercise of warrants 200,000 16,700,000                      
Net proceeds from exercise of warrants 160,000 16,720,000 18,702,000                    
Stock units granted         454,875 584,400 44,000         54,000  
Restricted stock units, issued as a result of vesting               93,048 97,398 0 0    
Restricted Stock units, Expenses 400,000 1,400,000 0         300,000 1,400,000 0 0    
Stock units, Vesting Period       4 years               3 years  
Deferred Stock units, Expenses                       $ 31,000  
Stock units, forfeited               251,818       0  
Deferred Stock units, issued as a result of vesting                       0