Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Additional Information (Detail)

v2.4.1.9
Stock Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock options granted, exercisable life 5 years    
Stock options remainder vesting period 2 years 2 years  
Stock options, authorized 2,954,293us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Stock based compensation $ 1,654,000us-gaap_ShareBasedCompensation   $ 1,417,000us-gaap_ShareBasedCompensation
Tax benefits related to stock based compensation 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense    
Shares repurchased 114,985us-gaap_TreasuryStockSharesAcquired   0us-gaap_TreasuryStockSharesAcquired
Average price per share $ 4.98us-gaap_TreasuryStockAcquiredAverageCostPerShare    
Common stock repurchased, value 572,000us-gaap_TreasuryStockValueAcquiredCostMethod    
Unrecognized compensation costs $ 4,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Compensation costs expected to be recognized 2 years 5 months 5 days    
Restricted Stock      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock options granted, exercisable life 3 years    
Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock options vested period 3 years    
Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock options vested period 5 years