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v3.10.0.1

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Consolidated Statements of Operations |  |  |
Net sales | $ 542,082 | $ 475,686 | $ 331,702
Cost of sales | 348,363 | 299,458 | 198,604
Gross profit | 193,719 | 176,228 | 133,098
Operating expenses, net: |  |  |
Research and development | 97,755 | 81,987 | 81,016
Selling, general, and administrative | 92,060 | 100,250 | 77,642
Amortization of intangible assets | 32,351 | 35,475 | 19,219
Restructuring | 8,556 | 11,851 | 5,640
Acquisition costs | 2,959 | 17,786 |
Asset impairment | 375,172 | 1,139 | 69,520
Other, net | 368 | (392) | 223
Total operating expenses, net | 609,221 | 248,096 | 253,260
Operating income (loss) | (415,502) | (71,868) | (120,162)
Interest income | 3,186 | 2,335 | 1,180
Interest expense | (21,518) | (19,457) | (222)
Income (loss) before income taxes | (433,834) | (88,990) | (119,204)
Income tax expense (benefit) | (26,746) | (37,594) | 2,823
Net income (loss) | $ (407,088) | $ (51,396) | $ (122,027)
Income (loss) per common share: |  |  |
Basic (in dollars per share) | $ (8.63) | $ (1.16) | $ (3.10)
Diluted (in dollars per share) | $ (8.63) | $ (1.16) | $ (3.10)
Weighted average number of shares: |  |  |
Basic (in shares) | 47,151 | 44,174 | 39,340
Diluted (in shares) | 47,151 | 44,174 | 39,340

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