Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues	$ 79,017us-gaap_Revenues	$ 109,338us-gaap_Revenues	$ 97,644us-gaap_Revenues
Costs and expenses:
Cost of sales	43,889us-gaap_CostOfRevenue	62,521us-gaap_CostOfRevenue	56,899us-gaap_CostOfRevenue
Selling, general and administrative	35,432	36,375	32,682
Research and development	1,459us-gaap_ResearchAndDevelopmentExpense	2,442us-gaap_ResearchAndDevelopmentExpense	2,863us-gaap_ResearchAndDevelopmentExpense
Goodwill impairment	23,400us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Costs and Expenses	104,180us-gaap_CostsAndExpenses	101,338us-gaap_CostsAndExpenses	92,444us-gaap_CostsAndExpenses
Operating (loss) income	(25,163)us-gaap_OperatingIncomeLoss	8,000us-gaap_OperatingIncomeLoss	5,200us-gaap_OperatingIncomeLoss
Interest expense	(125)us-gaap_InterestExpense	(56)us-gaap_InterestExpense	(93)us-gaap_InterestExpense
Interest income	29us-gaap_InvestmentIncomeInterest	58us-gaap_InvestmentIncomeInterest	78us-gaap_InvestmentIncomeInterest
Other expense	(544)us-gaap_OtherNonoperatingIncomeExpense	(137)us-gaap_OtherNonoperatingIncomeExpense	(107)us-gaap_OtherNonoperatingIncomeExpense
(Loss) Income before taxes	(25,803)	7,865	5,078
Income tax benefit (expense)	8,078us-gaap_IncomeTaxExpenseBenefit	(2,764)us-gaap_IncomeTaxExpenseBenefit	(2,302)us-gaap_IncomeTaxExpenseBenefit
Net (loss) income	$ (17,725)us-gaap_NetIncomeLoss	$ 5,101us-gaap_NetIncomeLoss	$ 2,776us-gaap_NetIncomeLoss
Net income per common share: (in dollars per share)
Basic	$ (0.78)us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic
Diluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted
Weighted-average number of common shares outstanding:
Basic	22,782,000	22,286,000	22,709,000
Diluted	22,782,000	22,579,000	23,535,000

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