UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net sales	$ 285,613	$ 218,795	$ 542,039	$ 413,814
Cost of sales	111,650	80,866	212,337	152,532
Gross margin	173,963	137,929	329,702	261,282
Operating expenses:
Sales, general and administrative	95,005	177,662	185,134	304,259
Research and development	57,547	53,952	105,963	100,970
Total operating expenses	152,552	231,614	291,097	405,229
Income (loss) from operations	21,411	(93,685)	38,605	(143,947)
Interest and other income, net	47,026	41,841	102,325	42,426
Income (loss) before provision for income taxes	68,437	(51,844)	140,930	(101,521)
Provision for (benefit from) income taxes	17,475	(4,727)	35,097	(6,487)
Net income (loss)	$ 50,962	$ (47,117)	$ 105,833	$ (95,034)
Net income (loss) per common and common equivalent shares:
Basic (in dollars per share)	$ 0.72	$ (0.72)	$ 1.49	$ (1.47)
Diluted (in dollars per share)	$ 0.71	$ (0.72)	$ 1.46	$ (1.47)
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	71,040	65,166	70,995	64,604
Diluted (in shares)	72,283	65,166	72,316	64,604
Net income (loss)	$ 50,962	$ (47,117)	$ 105,833	$ (95,034)
Foreign currency translation adjustments	(2,166)	(369)	(3,238)	(368)
Unrealized losses on available-for-sale investments	(161)		(650)
Comprehensive income (loss)	48,635	(47,486)	101,945	(95,402)
Product
Net sales	200,051	156,427	376,255	297,313
Cost of sales	87,502	65,301	166,854	123,917
Service
Net sales	85,562	62,368	165,784	116,501
Cost of sales	$ 24,148	$ 15,565	$ 45,483	$ 28,615