Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 79,242	$ 55,530
Cost of products sold and services delivered	30,572	18,628
Gross margin	48,670	36,902
Operating expenses:
Sales, general and administrative	30,857	24,833
Research and development	12,463	6,927
Total operating expenses	43,320	31,760
Income from operations	5,350	5,142
Interest and other income, net	206	118
Income before provision for income taxes	5,556	5,260
Provision for income taxes	976	1,797
Net income	$ 4,580	$ 3,463
Net income per common and common equivalent shares:
Basic (in dollars per share)	$ 0.09	$ 0.06
Diluted (in dollars per share)	$ 0.09	$ 0.06
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	52,418	53,693
Diluted (in shares)	53,677	54,789
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 4,580	$ 3,463
Foreign currency translation adjustments	165	234
Comprehensive income	$ 4,745	$ 3,697