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CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
REVENUE: |  |  |
Material sales | $ 113,066 | $ 126,885 | $ 95,713
Royalty and license fees | 77,773 | 63,192 | 47,006
Technology development and support revenue | 207 | 954 | 3,920
Total revenue | 191,046 | 191,031 | 146,639
OPERATING EXPENSES: |  |  |
Cost of material sales | 62,997 | 41,315 | 28,889
Research and development | 44,641 | 41,154 | 34,215
Selling, general and administrative | 29,046 | 28,135 | 24,745
Patent costs and amortization of acquired technology | 16,716 | 17,288 | 17,273
Royalty and license expense | 5,370 | 4,519 | 3,273
Total operating expenses | 158,770 | 132,411 | 108,395
Operating income | 32,276 | 58,620 | 38,244
INTEREST INCOME | 837 | 777 | 811
INTEREST EXPENSE | (54) | (70) | (47)
INCOME BEFORE INCOME TAXES | 33,059 | 59,327 | 39,008
INCOME TAX (EXPENSE) BENEFIT | (18,381) | (17,473) | 35,044
NET INCOME | $ 14,678 | $ 41,854 | $ 74,052
NET INCOME PER COMMON SHARE: |  |  |
BASIC (in dollars per share) | $ 0.31 | $ 0.90 | $ 1.61
DILUTED (in dollars per share) | $ 0.31 | $ 0.90 | $ 1.59
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE: |  |  |
BASIC (in shares) | 46,816,394 | 46,252,960 | 45,898,019
DILUTED (in shares) | 47,494,188 | 46,685,145 | 46,543,605

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