Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales	$ 195,019	$ 147,162
Cost of sales	71,666	58,554
Gross margin	123,353	88,608
Sales, general and administrative	126,597	63,027
Research and development	47,018	26,381
Total operating expenses	173,615	89,408
Income (loss) from operations	(50,262)	(800)
Interest and other income, net	585	941
Income (loss) before provision for income taxes	(49,677)	141
Provision for (benefit from) income taxes	(1,760)	(3,933)
Net income (loss)	$ (47,917)	$ 4,074
Net income (loss) per common and common equivalent shares:
Basic (in dollars per share)	$ (0.75)	$ 0.07
Diluted (in dollars per share)	$ (0.75)	$ 0.07
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	64,036	59,609
Diluted (in shares)	64,036	60,394
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (47,917)	$ 4,074
Foreign currency translation adjustments	1	(2,372)
Comprehensive income (loss)	(47,916)	1,702
Product
Net sales	140,886	107,288
Cost of sales	58,616	48,884
Service
Net sales	54,133	39,874
Cost of sales	$ 13,050	$ 9,670