Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net sales	$ 55,530	$ 44,762
Cost of products sold and services delivered	18,628	14,894
Gross margin	36,902	29,868
Operating expenses:
Sales, general and administrative	24,833	14,565
Research and development	6,927	4,558
Total operating expenses	31,760	19,123
Income from operations	5,142	10,745
Interest income and other income (expense), net	118	(65)
Income before provision for income taxes	5,260	10,680
Provision for income taxes	1,797	3,475
Net income	$ 3,463	$ 7,205
Net income per common and common equivalent shares:
Basic (in dollars per share)	$ 0.06	$ 0.14
Diluted (in dollars per share)	$ 0.06	$ 0.13
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	53,693	53,167
Diluted (in shares)	54,498	54,513
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 3,463	$ 7,205
Foreign currency translation adjustments	234	89
Comprehensive income	$ 3,697	$ 7,294