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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
REVENUE $ 405,177 $ 247,414 $ 335,629
COST OF SALES 75,374 53,541 54,698
Gross margin 329,803 193,873 280,931
OPERATING EXPENSES:      
Research and development 71,276 53,717 49,144
Selling, general and administrative 59,613 46,999 46,808
Amortization of acquired technology and other intangible assets 21,962 21,962 21,983
Patent costs 6,833 7,464 7,010
Royalty and license expense 11,776 6,996 9,739
Total operating expenses 171,460 137,138 134,684
OPERATING INCOME 158,343 56,735 146,247
Interest income, net 10,795 7,659 3,294
Other income (expense), net 767 (83) (4)
Interest and other income, net 11,562 7,576 3,290
INCOME BEFORE INCOME TAXES 169,905 64,311 149,537
INCOME TAX EXPENSE (31,601) (5,471) (45,652)
NET INCOME $ 138,304 $ 58,840 $ 103,885
NET INCOME PER COMMON SHARE:      
BASIC $ 2.92 $ 1.24 $ 2.19
DILUTED $ 2.92 $ 1.24 $ 2.18
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:      
BASIC 46,959,775 46,849,588 46,725,289
DILUTED 46,995,462 46,896,766 46,805,194
CASH DIVIDEND DECLARED PER COMMON SHARE $ 0.40 $ 0.24 $ 0.12