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CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement [Abstract] |  |  |  |
REVENUE | $ 56,149 | $ 102,513 | $ 99,721 | $ 158,079
COST OF SALES | 11,635 | 11,310 | 19,093 | 24,297
Gross margin | 44,514 | 91,203 | 80,628 | 133,782
OPERATING EXPENSES: |  |  |  |
Research and development | 12,949 | 10,685 | 25,306 | 22,503
Selling, general and administrative | 11,562 | 9,839 | 22,353 | 19,916
Amortization of acquired technology and other intangible assets | 5,495 | 5,495 | 10,986 | 10,987
Patent costs | 2,029 | 1,674 | 3,754 | 3,221
Royalty and license expense | 1,568 | 2,991 | 2,799 | 4,578
Total operating expenses | 33,603 | 30,684 | 65,198 | 61,205
OPERATING INCOME | 10,911 | 60,519 | 15,430 | 72,577
Interest income, net | 1,766 | 796 | 3,037 | 1,467
Other (expense) income, net | (12) | 6 | (59) | (13)
Interest and other (expense) income, net | 1,754 | 802 | 2,978 | 1,454
INCOME BEFORE INCOME TAXES | 12,665 | 61,321 | 18,408 | 74,031
INCOME TAX EXPENSE | (1,851) | (14,134) | (1,635) | (16,479)
NET INCOME | $ 10,814 | $ 47,187 | $ 16,773 | $ 57,552
NET INCOME PER COMMON SHARE: |  |  |  |
BASIC | $ 0.23 | $ 0.99 | $ 0.35 | $ 1.21
DILUTED | $ 0.23 | $ 0.99 | $ 0.35 | $ 1.21
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE: |  |  |  |
BASIC | 46,868,999 | 46,742,746 | 46,826,314 | 46,702,376
DILUTED | 46,901,098 | 46,810,238 | 46,873,109 | 46,781,120
CASH DIVIDENDS DECLARED PER COMMON SHARE | $ 0.06 | $ 0.03 | $ 0.12 | $ 0.06

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