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Recent Grant Dates And Related Exercise Prices Of Stock Options Granted to Employees And Directors (Detail) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares subject to option Granted 416,541   324,585 145,375 371,899
Fair Value Estimate per Common Share $ 7.05 $ 0.82 $ 0.82 $ 1.07 $ 0.82
January 26, 2011
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares subject to option Granted 92,939        
Exercise Price $ 1.46        
Fair Value Estimate per Common Share $ 0.82        
April 5, 2011
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares subject to option Granted 140,391        
Exercise Price $ 1.46        
Fair Value Estimate per Common Share $ 0.82        
July 19, 2011
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares subject to option Granted 91,255        
Exercise Price $ 1.46        
Fair Value Estimate per Common Share $ 0.82        
March 12, 2012
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares subject to option Granted 66,967        
Exercise Price $ 2.17        
Fair Value Estimate per Common Share $ 1.18        
July 31, 2012
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares subject to option Granted 349,574        
Exercise Price $ 4.74        
Fair Value Estimate per Common Share $ 8.16