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Subsequent Events - Additional Information (Detail) (USD $)
 6 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jul. 16, 2012
Stock Compensation Plan
Restricted Stock
Jul. 31, 2012
Stock Compensation Plan
Restricted Stock
Executive Officer
Month
Installment
Jul. 16, 2012
Stock Compensation Plan
Restricted Stock
Executive Officer
Jul. 31, 2012
Stock Compensation Plan
Restricted Stock
Employees
Installment
Jul. 31, 2012
Option Exercise
Certain employees
Subsequent Event [Line Items]              
Shares of common stock approved for grant         1,500,000    
Shares of common stock issued       1,100,000   400,000  
Number of installments for vesting of stock       16   12  
Shares of common stock issued, vesting period       4 years   3 years  
Shares of common stock issued, lock up period       24      
Fair value of common stock at grant date     $ 8,580,000        
Common Stock issued in connection with exercise of options             1,000
Cash proceeds from exercise of options $ 1,086,000 $ 259,000         $ 120