Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net sales	$ 147,162	$ 115,810
Cost of sales	58,554	46,893
Gross margin	88,608	68,917
Operating expenses:
Sales, general and administrative	63,027	42,892
Research and development	26,381	23,354
Total operating expenses	89,408	66,246
Income (loss) from operations	(800)	2,671
Interest and other income, net	941	2,313
Income before provision for income taxes	141	4,984
Benefit from income taxes	(3,933)	(1,435)
Net income	$ 4,074	$ 6,419
Net income per common and common equivalent shares:
Basic (in dollars per share)	$ 0.07	$ 0.11
Diluted (in dollars per share)	$ 0.07	$ 0.11
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	59,609	58,914
Diluted (in shares)	60,394	59,751
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 4,074	$ 6,419
Foreign currency translation adjustments	(2,372)	50
Comprehensive income	1,702	6,469
Product
Net sales	107,288	88,089
Cost of sales	48,884	39,600
Service
Net sales	39,874	27,721
Cost of sales	$ 9,670	$ 7,293