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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	$ 57,909us-gaap_SalesRevenueNet	$ 49,592us-gaap_SalesRevenueNet
Cost of goods sold	22,586us-gaap_CostOfGoodsSold	19,735us-gaap_CostOfGoodsSold
Gross profit	35,323us-gaap_GrossProfit	29,857us-gaap_GrossProfit
Operating expenses:
Sales and marketing	11,227us-gaap_SellingAndMarketingExpense	8,896us-gaap_SellingAndMarketingExpense
Research and product development	8,969us-gaap_ResearchAndDevelopmentExpense	7,562us-gaap_ResearchAndDevelopmentExpense
General and administrative	7,152us-gaap_GeneralAndAdministrativeExpense	6,416us-gaap_GeneralAndAdministrativeExpense
Proceeds from litigation, net	0us-gaap_OtherOperatingIncome	(639)us-gaap_OtherOperatingIncome
Total operating expenses	27,348us-gaap_OperatingExpenses	22,235us-gaap_OperatingExpenses
Operating income	7,975us-gaap_OperatingIncomeLoss	7,622us-gaap_OperatingIncomeLoss
Other income, net	254us-gaap_OtherOperatingIncomeExpenseNet	147us-gaap_OtherOperatingIncomeExpenseNet
Income before income taxes	8,229us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	7,769us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	(2,633)us-gaap_IncomeTaxExpenseBenefit	(2,590)us-gaap_IncomeTaxExpenseBenefit
Net income	5,596us-gaap_NetIncomeLoss	5,179us-gaap_NetIncomeLoss
Basic earnings per common share	$ 0.61us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic
Diluted earnings per common share	$ 0.58us-gaap_EarningsPerShareDiluted	$ 0.55us-gaap_EarningsPerShareDiluted
Basic weighted average shares outstanding	9,166,769us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,064,340us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average shares outstanding	9,581,326us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,455,518us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Unrealized gain on available-for-sale securities, net of tax	14us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	23us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Foreign Currency Transaction Gain (Loss), before Tax	(45)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	0us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Comprehensive income	$ 5,565us-gaap_ComprehensiveIncomeNetOfTax	$ 5,202us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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