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Net Income per Share - Computation of Basic and Diluted Net Income per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basic:    
Net income (loss) available for common stockholders $ 1,369us-gaap_NetIncomeLoss $ (207)us-gaap_NetIncomeLoss
Weighted average shares outstanding 17,422us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 15,586us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per share $ 0.08us-gaap_EarningsPerShareBasic $ (0.01)us-gaap_EarningsPerShareBasic
Diluted:    
Net income (loss) available for common stockholders $ 1,369us-gaap_NetIncomeLoss $ (207)us-gaap_NetIncomeLoss
Weighted-average shares outstanding 17,422us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 15,586us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Common stock equivalents, if diluted 374us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment  
Shares used in computing diluted earnings per common share 17,796us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 15,586us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share $ 0.08us-gaap_EarningsPerShareDiluted $ (0.01)us-gaap_EarningsPerShareDiluted
Shares excluded in computing diluted earnings per share as those shares would be anti-dilutive 277us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 616us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount