CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
REVENUE:
Total revenue	$ 136,561	$ 129,660	$ 287,031	$ 263,660
COST OF SALES	27,239	27,969	60,402	51,267
Gross margin	109,322	101,691	226,629	212,393
OPERATING EXPENSES:
Research and development	28,197	24,101	54,742	47,406
Selling, general and administrative	19,869	20,239	40,931	36,643
Amortization of acquired technology and other intangible assets	5,502	5,497	11,000	10,985
Patent costs	2,259	1,809	4,057	3,644
Royalty and license expense	181	149	335	261
Total operating expenses	56,008	51,795	111,065	98,939
OPERATING INCOME	53,314	49,896	115,564	113,454
Interest income, net	1,583	75	1,874	208
Other income, net	89	221	55	280
Interest and other income, net	1,672	296	1,929	488
INCOME BEFORE INCOME TAXES	54,986	50,192	117,493	113,942
INCOME TAX EXPENSE	(13,484)	(9,651)	(26,021)	(21,714)
NET INCOME	$ 41,502	$ 40,541	$ 91,472	$ 92,228
NET INCOME PER COMMON SHARE:
BASIC	$ 0.87	$ 0.85	$ 1.92	$ 1.94
DILUTED	$ 0.87	$ 0.85	$ 1.92	$ 1.94
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:
BASIC	47,393,830	47,299,627	47,381,864	47,284,773
DILUTED	47,457,892	47,356,864	47,451,354	47,347,596
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 0.30	$ 0.20	$ 0.60	$ 0.40
Material Sales
REVENUE:
Total revenue	$ 71,869	$ 77,438	$ 158,560	$ 157,246
Royalty And License Fees
REVENUE:
Total revenue	60,278	48,212	120,080	99,098
Contract Research Services
REVENUE:
Total revenue	$ 4,414	$ 4,010	$ 8,391	$ 7,316