CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
REVENUE:
Total revenue	$ 129,660,000	$ 57,968,000	$ 263,660,000	$ 170,245,000
COST OF SALES	27,969,000	12,643,000	51,267,000	35,102,000
Gross margin	101,691,000	45,325,000	212,393,000	135,143,000
OPERATING EXPENSES:
Research and development	24,101,000	21,397,000	47,406,000	40,894,000
Selling, general and administrative	20,239,000	16,147,000	36,643,000	31,550,000
Amortization of acquired technology and other intangible assets	5,497,000	5,490,000	10,985,000	10,980,000
Patent costs	1,809,000	1,858,000	3,644,000	3,496,000
Royalty and license expense	149,000	1,618,000	261,000	4,902,000
Total operating expenses	51,795,000	46,510,000	98,939,000	91,822,000
OPERATING INCOME (LOSS)	49,896,000	(1,185,000)	113,454,000	43,321,000
Interest income, net	75,000	1,268,000	208,000	3,415,000
Other income, net	221,000	170,000	280,000	372,000
Interest and other income, net	296,000	1,438,000	488,000	3,787,000
INCOME BEFORE INCOME TAXES	50,192,000	253,000	113,942,000	47,108,000
INCOME TAX (EXPENSE) BENEFIT	(9,651,000)	562,000	(21,714,000)	(8,138,000)
NET INCOME	$ 40,541,000	$ 815,000	$ 92,228,000	$ 38,970,000
NET INCOME PER COMMON SHARE:
BASIC	$ 0.85	$ 0.02	$ 1.94	$ 0.82
DILUTED	$ 0.85	$ 0.02	$ 1.94	$ 0.82
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:
BASIC	47,299,627	47,227,294	47,284,773	47,160,163
DILUTED	47,356,864	47,243,991	47,347,596	47,190,505
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 0.20	$ 0.15	$ 0.40	$ 0.30
Material Sales
REVENUE:
Total revenue	$ 77,438,000	$ 31,927,000	$ 157,246,000	$ 98,502,000
Royalty And License Fees
REVENUE:
Total revenue	48,212,000	22,380,000	99,098,000	65,458,000
Contract Research Services
REVENUE:
Total revenue	$ 4,010,000	$ 3,661,000	$ 7,316,000	$ 6,285,000