Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net sales	$ 164,525us-gaap_SalesRevenueNet	$ 137,831us-gaap_SalesRevenueNet	$ 114,753us-gaap_SalesRevenueNet
Cost of products sold and services delivered	62,977us-gaap_CostOfGoodsAndServicesSold	51,988us-gaap_CostOfGoodsAndServicesSold	47,038us-gaap_CostOfGoodsAndServicesSold
Gross margin	101,548us-gaap_GrossProfit	85,843us-gaap_GrossProfit	67,715us-gaap_GrossProfit
Operating expenses:
Sales, general and administrative	54,158	46,557	39,247
Research and development	14,885us-gaap_ResearchAndDevelopmentExpense	9,888us-gaap_ResearchAndDevelopmentExpense	8,139us-gaap_ResearchAndDevelopmentExpense
Litigation judgments (recoveries)	0	1,450	(2,200)
Total operating expenses	69,043us-gaap_OperatingExpenses	57,895us-gaap_OperatingExpenses	45,186us-gaap_OperatingExpenses
Income from operations	32,505us-gaap_OperatingIncomeLoss	27,948us-gaap_OperatingIncomeLoss	22,529us-gaap_OperatingIncomeLoss
Interest and other (expense) income, net	(194)	86	83
Income before provision for income taxes	32,311	28,034	22,612
Provision for income taxes	12,393us-gaap_IncomeTaxExpenseBenefit	9,790us-gaap_IncomeTaxExpenseBenefit	7,874us-gaap_IncomeTaxExpenseBenefit
Net income	19,918us-gaap_NetIncomeLoss	18,244us-gaap_NetIncomeLoss	14,738us-gaap_NetIncomeLoss
Net income per common and common equivalent shares:
Basic (in dollars per share)	$ 0.38us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.27us-gaap_EarningsPerShareDiluted
Weighted average number of common and common equivalent shares outstanding:
Weighted average shares outstanding—basic	52,948	51,880	53,827
Diluted (in shares)	54,500	54,152	54,723
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	19,918us-gaap_NetIncomeLoss	18,244us-gaap_NetIncomeLoss	14,738us-gaap_NetIncomeLoss
Foreign currency translation adjustments	66	55	24
Comprehensive income	$ 19,984	$ 18,299	$ 14,762

Benefit on reversal of accrued litigation.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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