Condensed Consolidated Statements of Operations and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 36,185	$ 30,434
Cost of products sold and services delivered	13,977	11,983
Gross margin	22,208	18,451
Sales, general and administrative expenses	13,746	11,181
Research and development expenses	3,606	2,013
Income from operations	4,856	5,257
Interest and other income (expense), net	30	(23)
Income before provision for income taxes	4,886	5,234
Provision for income taxes	1,495	1,936
Net income	3,391	3,298
Income per common and common equivalent shares
Basic	$ 0.06	$ 0.06
Diluted	$ 0.06	$ 0.06
Weighted average number of common and common equivalent shares outstanding
Basic	53,190	52,746
Diluted	55,124	54,600
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	3,391	3,298
Foreign currency translation adjustments	10	(18)
Comprehensive income	$ 3,401	$ 3,280