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Quarterly Results of Operations (unaudited) - Schedule of Quarterly Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 62,426 us-gaap_SalesRevenueNet | $ 52,633 us-gaap_SalesRevenueNet | $ 47,654 us-gaap_SalesRevenueNet | $ 38,823 us-gaap_SalesRevenueNet | $ 43,265 us-gaap_SalesRevenueNet | $ 39,156 us-gaap_SalesRevenueNet | $ 37,260 us-gaap_SalesRevenueNet | $ 35,365 us-gaap_SalesRevenueNet | $ 201,537 us-gaap_SalesRevenueNet | $ 155,047 us-gaap_SalesRevenueNet | $ 154,029 us-gaap_SalesRevenueNet
Gross profit | 35,354 us-gaap_GrossProfit | 35,595 us-gaap_GrossProfit | 31,021 us-gaap_GrossProfit | 25,796 us-gaap_GrossProfit | 27,846 us-gaap_GrossProfit | 25,054 us-gaap_GrossProfit | 23,882 us-gaap_GrossProfit | 23,087 us-gaap_GrossProfit | 127,766 us-gaap_GrossProfit | 99,871 us-gaap_GrossProfit | 99,565 us-gaap_GrossProfit
Operating expenses | 22,645 us-gaap_OperatingExpenses | 21,753 us-gaap_OperatingExpenses | 23,375 us-gaap_OperatingExpenses | 21,905 us-gaap_OperatingExpenses | 23,805 us-gaap_OperatingExpenses | 20,023 us-gaap_OperatingExpenses | 21,958 us-gaap_OperatingExpenses | 20,372 us-gaap_OperatingExpenses | 89,678 us-gaap_OperatingExpenses | 86,159 us-gaap_OperatingExpenses | 78,538 us-gaap_OperatingExpenses
Operating income | 12,709 us-gaap_OperatingIncomeLoss | 13,842 us-gaap_OperatingIncomeLoss | 7,646 us-gaap_OperatingIncomeLoss | 3,891 us-gaap_OperatingIncomeLoss | 4,041 us-gaap_OperatingIncomeLoss | 5,031 us-gaap_OperatingIncomeLoss | 1,924 us-gaap_OperatingIncomeLoss | 2,715 us-gaap_OperatingIncomeLoss | 38,088 us-gaap_OperatingIncomeLoss | 13,712 us-gaap_OperatingIncomeLoss | 21,027 us-gaap_OperatingIncomeLoss
Income from Continuing Operations | 10,983 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 11,209 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 6,893 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 3,526 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 3,336 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 3,369 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 1,850 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 2,412 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 32,611 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 10,967 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 16,229 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income (loss) from Discontinued Operations | 941 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (46)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (7)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (16)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (105)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (47)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (41)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 374 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 873 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 180 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (630)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income | $ 11,924 us-gaap_NetIncomeLoss | $ 11,163 us-gaap_NetIncomeLoss | $ 6,886 us-gaap_NetIncomeLoss | $ 3,510 us-gaap_NetIncomeLoss | $ 3,231 us-gaap_NetIncomeLoss | $ 3,322 us-gaap_NetIncomeLoss | $ 1,809 us-gaap_NetIncomeLoss | $ 2,786 us-gaap_NetIncomeLoss | $ 33,484 us-gaap_NetIncomeLoss | $ 11,147 us-gaap_NetIncomeLoss | $ 15,599 us-gaap_NetIncomeLoss
Basic income/(loss) per share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.18 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.05 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.06 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.83 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.43 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued Operations | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total Net income per share | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.18 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.08 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic | $ 0.07 us-gaap_EarningsPerShareBasic | $ 0.85 us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.41 us-gaap_EarningsPerShareBasic
Diluted income/(loss) per share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.17 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.08 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.05 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.06 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.83 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.42 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued Operations | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total Net income per share | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 0.08 us-gaap_EarningsPerShareDiluted | $ 0.08 us-gaap_EarningsPerShareDiluted | $ 0.05 us-gaap_EarningsPerShareDiluted | $ 0.07 us-gaap_EarningsPerShareDiluted | $ 0.85 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.40 us-gaap_EarningsPerShareDiluted

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