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Share Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 55,000 $ 53,000 $ 122,000 $ 118,000
1998 Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares Outstanding 174,950   174,950  
2007 Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized but unissued stock and reserved for issuance 1,500,000   1,500,000  
Number of remaining shares available for grant 897,580   897,580