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Equity - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jan. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Feb. 29, 2012
Restricted Stock Units (RSUs)
Dec. 31, 2012
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]            
Shares issued, exercise of stock options   3,380,413 2,273,221      
Gross proceeds from exercise of stock options   $ 8,200,000 $ 5,200,000      
Net proceeds from exercise of stock options   8,200,000 5,100,000      
Shares issued, exercise of warrants   11,047,579 12,888,369      
Gross proceeds from exercise of warrants   16,700,000 19,000,000      
Net proceeds from exercise of warrants   16,720,000 18,702,000 8,904,000    
Restricted stock units, Granted         584,400  
Restricted stock units, expiration date           Feb. 01, 2015
Restricted stock units, Expenses   1,400,000 0 0   1,400,000
Restricted stock units shares issued           97,398
Common stock issued, shares 13,800,000          
Common stock issued, price per share $ 7.60          
Gross proceed from common shares issued 104,900,000          
Proceed from common shares issued $ 98,700,000   $ 98,654,000