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Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 6 Months Ended
Jan. 31, 2013
Feb. 29, 2012
Jun. 30, 2013
Jun. 30, 2012
Stockholders Equity Note [Line Items]        
Shares issued, exercise of stock options     319,750 2,485,647
Gross proceeds from exercise of stock options     $ 0.5 $ 6.7
Net proceeds from exercise of stock options     0.5 6.7
Shares issued, exercise of warrants     70,000 9,812,622
Gross proceeds from exercise of warrants     0.1 15.0
Net proceeds from exercise of warrants     0.1 14.9
Restricted Stock Units (RSUs)
        
Stockholders Equity Note [Line Items]        
Restricted stock units granted 434,875 584,400    
Restricted stock units, expiration date Aug. 03, 2015 Feb. 01, 2015    
Restricted stock units, Expenses     $ 0.3 $ 1.0