Quarterly report pursuant to Section 13 or 15(d)

Stock Based Awards and Per Share Information - Additional Information (Detail)

v2.4.0.6
Stock Based Awards and Per Share Information - Additional Information (Detail) (USD $)
 3 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2013
Subsequent Event
Mar. 23, 2013
IR Warrant 2
Mar. 23, 2013
IR Warrant 2
Maximum
Mar. 23, 2013
IR Warrant 2
Minimum
Mar. 31, 2013
2002 Stock Incentive Plan
Mar. 23, 2013
Bonus award
IR Warrant 2
Mar. 23, 2013
Bonus award
IR Warrant 2
Maximum
Stock Based Compensation Activity [Line Items]                    
Common stock authorized for issuance under the 2002 Plan               6,950,000    
Common stock issued pursuant to options exercised               2,527,000    
Options outstanding 4,337,000   3,860,000         4,337,000    
Options available for future grant               86,000    
Compensation cost related to stock options $ 368,000 $ 583,000                
Net impact of share based compensation expense to earnings per basic share $ (0.01) $ (0.01)                
Net impact of share based compensation expense to earnings per diluted share $ (0.01) $ (0.01)                
Total unrecognized compensation cost $ 2,500,000                  
Unrecognized share based compensation cost to be recognized over weighted-average period 1 year 3 months 18 days                  
Warrants issued to purchase common stock           50,000       50,000
Warrants price of warrants         4.50          
Minimum required closing price of common stock on the NASDAQ in order to exercise             $ 7.50   $ 10.00  
Warrant expiration date         Mar. 22, 2018          
Outstanding stock options and warrants excluded from diluted loss per share 5,060,000 4,514,000                
Special stock dividends intended for the year ended 12/31/2013       2.00%            
Dividends declared, date of record Mar. 15, 2013                  
Special stock dividends declared 0.50%