CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
REVENUE:
Total revenue	$ 130,467	$ 150,470
COST OF SALES	32,970	33,163
Gross margin	97,497	117,307
OPERATING EXPENSES:
Research and development	31,423	26,545
Selling, general and administrative	15,396	21,062
Amortization of acquired technology and other intangible assets	2,891	5,498
Patent costs	2,255	1,798
Royalty and license expense	164	154
Total operating expenses	52,129	55,057
OPERATING INCOME	45,368	62,250
Interest income, net	6,967	291
Other (loss) income, net	(703)	(34)
Interest and other income, net	6,264	257
INCOME BEFORE INCOME TAXES	51,632	62,507
Income tax expense (benefit)	(11,793)	(12,537)
NET INCOME	$ 39,839	$ 49,970
NET INCOME PER COMMON SHARE:
BASIC	$ 0.83	$ 1.05
DILUTED	$ 0.83	$ 1.05
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER OMMON SHARE:
BASIC	47,523,593	47,369,764
DILUTED	47,567,007	47,440,281
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 0.35	$ 0.30
Material Sales
REVENUE:
Total revenue	$ 70,190	$ 86,691
Royalty And License Fees
REVENUE:
Total revenue	55,210	59,802
Contract Research Services
REVENUE:
Total revenue	$ 5,067	$ 3,977