Condensed Consolidated Statements of Operations and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 44,349	$ 35,197	$ 117,709	$ 97,806
Cost of products sold and services delivered	15,636	13,101	43,574	37,517
Gross margin	28,713	22,096	74,135	60,289
Sales, general and administrative expenses	12,441	12,776	39,734	34,898
Research and development expenses	3,759	2,439	10,820	6,444
Income from operations	12,513	6,881	23,581	18,947
Interest and other income (expense), net	(160)	35	(88)	31
Income before provision for income taxes	12,353	6,916	23,493	18,978
Provision for income taxes	4,795	1,802	8,661	6,109
Net income	7,558	5,114	14,832	12,869
Income per common and common equivalent shares
Basic	$ 0.14	$ 0.10	$ 0.28	$ 0.25
Diluted	$ 0.14	$ 0.10	$ 0.27	$ 0.24
Weighted average number of common and common equivalent shares outstanding
Basic	52,475	51,342	53,013	51,727
Diluted	53,821	53,321	54,550	53,644
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	7,558	5,114	14,832	12,869
Foreign currency translation adjustments	(15)	92		29
Comprehensive income	$ 7,543	$ 5,206	$ 14,832	$ 12,898