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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
REVENUE $ 118,168 $ 56,149 $ 205,933 $ 99,721
COST OF SALES 24,072 11,635 39,886 19,093
Gross margin 94,096 44,514 166,047 80,628
OPERATING EXPENSES:        
Research and development 18,833 12,949 34,662 25,306
Selling, general and administrative 15,939 11,562 27,908 22,353
Amortization of acquired technology and other intangible assets 5,490 5,495 10,976 10,986
Patent costs 1,716 2,029 3,486 3,754
Royalty and license expense 3,454 1,568 5,991 2,799
Total operating expenses 45,432 33,603 83,023 65,198
OPERATING INCOME 48,664 10,911 83,024 15,430
Interest income, net 2,757 1,766 5,588 3,037
Other income (expense), net 405 (12) 687 (59)
Interest and other income, net 3,162 1,754 6,275 2,978
INCOME BEFORE INCOME TAXES 51,826 12,665 89,299 18,408
INCOME TAX EXPENSE (8,386) (1,851) (14,385) (1,635)
NET INCOME $ 43,440 $ 10,814 $ 74,914 $ 16,773
NET INCOME PER COMMON SHARE:        
BASIC $ 0.92 $ 0.23 $ 1.58 $ 0.35
DILUTED $ 0.92 $ 0.23 $ 1.58 $ 0.35
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:        
BASIC 46,967,005 46,868,999 46,930,165 46,826,314
DILUTED 46,996,702 46,901,098 46,966,172 46,873,109
CASH DIVIDENDS DECLARED PER COMMON SHARE $ 0.10 $ 0.06 $ 0.20 $ 0.12