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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
REVENUE: |  |  |  |
Material sales | $ 34,128 | $ 27,494 | $ 85,270 | $ 98,746
Royalty and license fees | 5,224 | 5,357 | 43,332 | 35,200
Technology development and support revenue | 67 | 41 | 132 | 911
Total revenue | 39,419 | 32,892 | 128,734 | 134,857
OPERATING EXPENSES: |  |  |  |
Cost of material sales | 7,246 | 7,388 | 54,913 | 29,236
Research and development | 11,434 | 7,915 | 32,000 | 28,639
Selling, general and administrative | 7,240 | 6,625 | 20,145 | 19,576
Patent costs and amortization of acquired technology | 4,032 | 4,081 | 12,461 | 12,801
Royalty and license expense | 1,105 | 803 | 3,563 | 3,060
Total operating expenses | 31,057 | 26,812 | 123,082 | 93,312
Operating income | 8,362 | 6,080 | 5,652 | 41,545
INTEREST INCOME | 232 | 187 | 593 | 598
INTEREST EXPENSE | (7) | (17) | (31) | (55)
INCOME BEFORE INCOME TAXES | 8,587 | 6,250 | 6,214 | 42,088
INCOME TAX EXPENSE | (1,540) | (1,966) | (9,624) | (13,360)
NET INCOME (LOSS) | $ 7,047 | $ 4,284 | $ (3,410) | $ 28,728
NET INCOME (LOSS) PER COMMON SHARE: |  |  |  |
Basic (in dollars per share) | $ 0.15 | $ 0.09 | $ (0.07) | $ 0.62
Diluted (in dollars per share) | $ 0.15 | $ 0.09 | $ (0.07) | $ 0.61
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME (LOSS) PER COMMON SHARE: |  |  |  |
Weighted average common shares outstanding - Basic (in shares) | 46,542,556 | 46,197,713 | 46,241,578 | 46,398,644
Weighted average common shares outstanding - Diluted (in shares) | 46,723,373 | 46,633,763 | 46,241,578 | 46,956,428

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