UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net sales	$ 256,426	$ 195,019
Cost of sales	100,687	71,666
Gross margin	155,739	123,353
Sales, general and administrative	90,129	126,597
Research and development	48,416	47,018
Total operating expenses	138,545	173,615
Income (loss) from operations	17,194	(50,262)
Interest and other income, net	55,299	585
Income (loss) before provision for income taxes	72,493	(49,677)
Provision for (benefit from) income taxes	17,622	(1,760)
Net income (loss)	$ 54,871	$ (47,917)
Net income (loss) per common and common equivalent shares:
Basic (in dollars per share)	$ 0.77	$ (0.75)
Diluted (in dollars per share)	$ 0.76	$ (0.75)
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	70,950	64,036
Diluted (in shares)	72,349	64,036
Net income (loss)	$ 54,871	$ (47,917)
Foreign currency translation adjustments	(1,072)	1
Unrealized gains (losses) on available-for-sale investments	(489)
Comprehensive income (loss)	53,310	(47,916)
Product
Net sales	176,204	140,886
Cost of sales	79,352	58,616
Service
Net sales	80,222	54,133
Cost of sales	$ 21,335	$ 13,050