CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
REVENUE:
Total revenue	$ 150,470	$ 134,000
COST OF SALES	33,163	23,298
Gross margin	117,307	110,702
OPERATING EXPENSES:
Research and development	26,545	23,305
Selling, general and administrative	21,062	16,404
Amortization of acquired technology and other intangible assets	5,498	5,488
Patent costs	1,798	1,835
Royalty and license expense	154	112
Total operating expenses	55,057	47,144
OPERATING INCOME	62,250	63,558
Interest income, net	291	133
Other (loss) income, net	(34)	59
Interest and other income, net	257	192
INCOME BEFORE INCOME TAXES	62,507	63,750
INCOME TAX EXPENSE	(12,537)	(12,063)
NET INCOME	$ 49,970	$ 51,687
NET INCOME PER COMMON SHARE:
BASIC	$ 1.05	$ 1.09
DILUTED	$ 1.05	$ 1.08
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:
BASIC	47,369,764	47,267,921
DILUTED	47,440,281	47,329,704
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 0.30	$ 0.20
Material Sales
REVENUE:
Total revenue	$ 86,691	$ 79,808
Royalty And License Fees
REVENUE:
Total revenue	59,802	50,886
Contract Research Services
REVENUE:
Total revenue	$ 3,977	$ 3,306