Condensed Consolidated Statements of Operations and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Net sales	$ 37,175	$ 32,175	$ 73,360	$ 62,609
Cost of products sold and services delivered	13,961	12,433	27,938	24,416
Gross margin	23,214	19,742	45,422	38,193
Sales, general and administrative expenses	13,547	10,941	27,293	22,122
Research and development expenses	3,455	1,992	7,061	4,005
Income from operations	6,212	6,809	11,068	12,066
Interest and other income (expense), net	42	19	72	(4)
Income before provision for income taxes	6,254	6,828	11,140	12,062
Provision for income taxes	2,370	2,371	3,865	4,307
Net income	3,884	4,457	7,275	7,755
Income per common and common equivalent shares
Basic	$ 0.07	$ 0.09	$ 0.14	$ 0.15
Diluted	$ 0.07	$ 0.08	$ 0.13	$ 0.14
Weighted average number of common and common equivalent shares outstanding
Basic	53,383	51,109	53,287	51,923
Diluted	54,755	52,853	54,928	53,699
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	3,884	4,457	7,275	7,755
Foreign currency translation adjustments	5	(45)	15	(63)
Comprehensive income	$ 3,889	$ 4,412	$ 7,290	$ 7,692