Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 71,882	$ 50,376	$ 186,168	$ 141,851
Cost of products sold and services delivered	25,317	19,308	65,402	50,192
Gross margin	46,565	31,068	120,766	91,659
Operating expenses:
Sales, general and administrative	28,121	17,834	77,333	47,842
Research and development	7,358	6,528	20,995	16,992
Total operating expenses	35,479	24,362	98,328	64,834
Income from operations	11,086	6,706	22,438	26,825
Interest income and other (expense) income, net	(455)	(22)	(460)	12
Income before provision for income taxes	10,631	6,684	21,978	26,837
Provision for income taxes	6,788	5,163	11,022	12,008
Net income	$ 3,843	$ 1,521	$ 10,956	$ 14,829
Net income per common and common equivalent shares:
Basic (in dollars per share)	$ 0.07	$ 0.03	$ 0.21	$ 0.28
Diluted (in dollars per share)	$ 0.07	$ 0.03	$ 0.20	$ 0.27
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	52,206	53,709	52,791	53,509
Diluted (in shares)	53,141	54,691	53,656	54,671
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 3,843	$ 1,521	$ 10,956	$ 14,829
Foreign currency translation adjustments	61	(115)	320	(18)
Comprehensive income	$ 3,904	$ 1,406	$ 11,276	$ 14,811