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Calculations of Basic and Diluted Loss per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share Disclosure [Line Items]      
Net income - Basic and Diluted $ 1,544us-gaap_NetIncomeLoss $ 9,281us-gaap_NetIncomeLoss $ 20,947us-gaap_NetIncomeLoss
Weighted-average shares outstanding - Basic 13,519us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,757us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,511us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:      
Stock options 455us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 286us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 299us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted-average shares outstanding - Diluted 13,974us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 13,043us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,810us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic income per common share $ 0.11us-gaap_EarningsPerShareBasic $ 0.73us-gaap_EarningsPerShareBasic $ 1.67us-gaap_EarningsPerShareBasic
Diluted income per common share $ 0.11us-gaap_EarningsPerShareDiluted $ 0.71us-gaap_EarningsPerShareDiluted $ 1.64us-gaap_EarningsPerShareDiluted