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Quarterly Financial Data (Unaudited) (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
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]                      
Revenue $ 43,444,000us-gaap_SalesRevenueNet $ 43,170,000us-gaap_SalesRevenueNet $ 43,124,000us-gaap_SalesRevenueNet $ 42,318,000us-gaap_SalesRevenueNet $ 50,736,000us-gaap_SalesRevenueNet $ 38,385,000us-gaap_SalesRevenueNet $ 38,175,000us-gaap_SalesRevenueNet $ 38,905,000us-gaap_SalesRevenueNet $ 172,056,000us-gaap_SalesRevenueNet $ 166,201,000us-gaap_SalesRevenueNet $ 151,661,000us-gaap_SalesRevenueNet
Cost of sales 30,415,000us-gaap_CostOfGoodsAndServicesSold 28,454,000us-gaap_CostOfGoodsAndServicesSold 28,342,000us-gaap_CostOfGoodsAndServicesSold 29,067,000us-gaap_CostOfGoodsAndServicesSold 34,116,000us-gaap_CostOfGoodsAndServicesSold 23,411,000us-gaap_CostOfGoodsAndServicesSold 24,803,000us-gaap_CostOfGoodsAndServicesSold 25,878,000us-gaap_CostOfGoodsAndServicesSold 116,278,000us-gaap_CostOfGoodsAndServicesSold 108,208,000us-gaap_CostOfGoodsAndServicesSold 96,509,000us-gaap_CostOfGoodsAndServicesSold
Gross profit 13,029,000us-gaap_GrossProfit 14,716,000us-gaap_GrossProfit 14,782,000us-gaap_GrossProfit 13,251,000us-gaap_GrossProfit 16,620,000us-gaap_GrossProfit 14,974,000us-gaap_GrossProfit 13,372,000us-gaap_GrossProfit 13,027,000us-gaap_GrossProfit 55,778,000us-gaap_GrossProfit 57,993,000us-gaap_GrossProfit 55,152,000us-gaap_GrossProfit
Operating expenses:                      
Product development and engineering 4,803,000us-gaap_ResearchAndDevelopmentExpense 5,060,000us-gaap_ResearchAndDevelopmentExpense 5,392,000us-gaap_ResearchAndDevelopmentExpense 5,578,000us-gaap_ResearchAndDevelopmentExpense 5,652,000us-gaap_ResearchAndDevelopmentExpense 4,627,000us-gaap_ResearchAndDevelopmentExpense 4,454,000us-gaap_ResearchAndDevelopmentExpense 4,648,000us-gaap_ResearchAndDevelopmentExpense 20,833,000us-gaap_ResearchAndDevelopmentExpense 19,381,000us-gaap_ResearchAndDevelopmentExpense 15,344,000us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 10,577,000us-gaap_SellingGeneralAndAdministrativeExpense 10,080,000us-gaap_SellingGeneralAndAdministrativeExpense 10,516,000us-gaap_SellingGeneralAndAdministrativeExpense 11,522,000us-gaap_SellingGeneralAndAdministrativeExpense 10,840,000us-gaap_SellingGeneralAndAdministrativeExpense 10,308,000us-gaap_SellingGeneralAndAdministrativeExpense 9,453,000us-gaap_SellingGeneralAndAdministrativeExpense 12,392,000us-gaap_SellingGeneralAndAdministrativeExpense 42,695,000us-gaap_SellingGeneralAndAdministrativeExpense 42,993,000us-gaap_SellingGeneralAndAdministrativeExpense 48,599,000us-gaap_SellingGeneralAndAdministrativeExpense
Total operating expenses 15,380,000us-gaap_OperatingExpenses 15,140,000us-gaap_OperatingExpenses 15,908,000us-gaap_OperatingExpenses 17,100,000us-gaap_OperatingExpenses 16,492,000us-gaap_OperatingExpenses 14,935,000us-gaap_OperatingExpenses 13,907,000us-gaap_OperatingExpenses 17,040,000us-gaap_OperatingExpenses 63,528,000us-gaap_OperatingExpenses 62,374,000us-gaap_OperatingExpenses 64,999,000us-gaap_OperatingExpenses
Operating loss (2,351,000)us-gaap_OperatingIncomeLoss (424,000)us-gaap_OperatingIncomeLoss (1,126,000)us-gaap_OperatingIncomeLoss (3,849,000)us-gaap_OperatingIncomeLoss 128,000us-gaap_OperatingIncomeLoss 39,000us-gaap_OperatingIncomeLoss (535,000)us-gaap_OperatingIncomeLoss (4,013,000)us-gaap_OperatingIncomeLoss (7,750,000)us-gaap_OperatingIncomeLoss (4,381,000)us-gaap_OperatingIncomeLoss (9,847,000)us-gaap_OperatingIncomeLoss
Interest expense (23,000)us-gaap_InterestExpense (116,000)us-gaap_InterestExpense (40,000)us-gaap_InterestExpense (150,000)us-gaap_InterestExpense (112,000)us-gaap_InterestExpense (41,000)us-gaap_InterestExpense (241,000)us-gaap_InterestExpense (132,000)us-gaap_InterestExpense (329,000)us-gaap_InterestExpense (526,000)us-gaap_InterestExpense (601,000)us-gaap_InterestExpense
Other income (loss), net 387,000us-gaap_OtherNonoperatingIncomeExpense 227,000us-gaap_OtherNonoperatingIncomeExpense (420,000)us-gaap_OtherNonoperatingIncomeExpense 33,000us-gaap_OtherNonoperatingIncomeExpense (190,000)us-gaap_OtherNonoperatingIncomeExpense (132,000)us-gaap_OtherNonoperatingIncomeExpense (102,000)us-gaap_OtherNonoperatingIncomeExpense 17,000us-gaap_OtherNonoperatingIncomeExpense 227,000us-gaap_OtherNonoperatingIncomeExpense (407,000)us-gaap_OtherNonoperatingIncomeExpense (54,000)us-gaap_OtherNonoperatingIncomeExpense
Loss before income taxes (1,987,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (313,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (1,586,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (3,966,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (174,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (134,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (878,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (4,128,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (7,852,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (5,314,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (8,188,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 2,644,000us-gaap_IncomeTaxExpenseBenefit 727,000us-gaap_IncomeTaxExpenseBenefit 681,000us-gaap_IncomeTaxExpenseBenefit 251,000us-gaap_IncomeTaxExpenseBenefit 1,075,000us-gaap_IncomeTaxExpenseBenefit 12,000us-gaap_IncomeTaxExpenseBenefit 115,000us-gaap_IncomeTaxExpenseBenefit 306,000us-gaap_IncomeTaxExpenseBenefit 4,303,000us-gaap_IncomeTaxExpenseBenefit 1,508,000us-gaap_IncomeTaxExpenseBenefit (1,013,000)us-gaap_IncomeTaxExpenseBenefit
Net loss (4,631,000)us-gaap_ProfitLoss (1,040,000)us-gaap_ProfitLoss (2,267,000)us-gaap_ProfitLoss (4,217,000)us-gaap_ProfitLoss (1,249,000)us-gaap_ProfitLoss (146,000)us-gaap_ProfitLoss (993,000)us-gaap_ProfitLoss (4,434,000)us-gaap_ProfitLoss (12,155,000)us-gaap_ProfitLoss (6,822,000)us-gaap_ProfitLoss 5,664,000us-gaap_ProfitLoss
Net loss per share — basic and diluted (usd per share) $ (0.63)us-gaap_EarningsPerShareBasicAndDiluted $ (0.14)us-gaap_EarningsPerShareBasicAndDiluted $ (0.31)us-gaap_EarningsPerShareBasicAndDiluted $ (0.58)us-gaap_EarningsPerShareBasicAndDiluted $ (0.17)us-gaap_EarningsPerShareBasicAndDiluted $ (0.02)us-gaap_EarningsPerShareBasicAndDiluted $ (0.13)us-gaap_EarningsPerShareBasicAndDiluted $ (0.59)us-gaap_EarningsPerShareBasicAndDiluted $ (1.66)us-gaap_EarningsPerShareBasicAndDiluted $ (0.91)us-gaap_EarningsPerShareBasicAndDiluted $ 0.72us-gaap_EarningsPerShareBasicAndDiluted
Basic and diluted weighted average shares 7,368us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 7,362us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 7,360us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 7,283us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 7,443us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 7,522us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 7,585us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 7,568us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted      
increase in provision for income taxes related to increase in valuation allowance on deferred tax assets $ 1,900,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance