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Equity Incentive Plans - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock issued 98,822,654       76,823,220       98,822,654 76,823,220  
Share based compensation expenses $ 619,000 $ 447,000 $ 425,000 $ 429,000 $ 415,000 $ 334,000 $ 194,000 $ 207,000 $ 1,920,000 $ 1,150,000 $ 1,432,000
Stock Option Awards
                     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock options plan expense                 0 0 23,000
Stock option outstanding 0               0    
Restricted Stock Award
                     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock issued 160,534               160,534    
Restricted stock expense                 300    
Share based compensation expenses                 1,620,000    
Unrecorded compensation expenses 8,727               8,727    
Weighted average remaining period of recognition (in years)                 3 years 9 months 18 days    
Total fair value of restricted stock awards                 $ 1,807,000 $ 829,000 $ 1,848,000
Minimum | Restricted Stock Award
                     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting Period                 3 years    
Maximum | Stock Option Awards
                     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock option awarded exercisable period                 10 years    
Maximum | Restricted Stock Award
                     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting Period                 5 years    
Equity Incentive Plan
                     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Awards relating to share of common stock available for grant 792,543               792,543    
Stock granted under plan period                 10 years    
Equity Incentive Plan | Minimum
                     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting Period                 3 years    
Equity Incentive Plan | Maximum
                     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting Period                 5 years