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Equity - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Jan. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Feb. 29, 2012
Restricted Stock Units (RSUs)
Mar. 31, 2012
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]          
Shares issued, exercise of stock options   554,259 994,749    
Net proceeds from exercise of stock options   $ 791,000 $ 1,724,000    
Gross proceeds from exercise of stock options   800,000 1,750,000    
Shares issued, exercise of warrants   40,000 4,557,364    
Gross proceeds from exercise of warrants   60,000 6,600,000    
Net proceeds from exercise of warrants   59,000 6,454,000    
Restricted stock units granted       584,400  
Restricted stock units, expiration date       Feb. 01, 2015  
Expenses related to vesting of the RSU         400,000
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   $ 98,671,000