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Organization and Summary of Significant Accounting Policies - Impact of Adoption of Topic 606 and Topic 842 on the Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Sep. 28, 2018 | Sep. 29, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | $ 225,397 | $ 152,510 | $ 625,224 | $ 332,405
Selling, general and administrative expenses | 48,120 | 38,129 | 153,989 | 113,084
Total operating expenses | 100,221 | 71,330 | 297,971 | 203,926
Interest expense | 1 | 0 | 1 | 8,679
Total other income, net | 3,778 | 3,408 | 8,467 | (8,820)
Income before income taxes | 128,954 | 84,588 | 335,720 | 119,659
Provision for income taxes | 2,324 | 3,206 | 5,739 | 3,921
Net income | $ 126,630 | $ 81,382 | $ 329,981 | $ 115,738
Net income per share, basic (in dollars per share) | $ 0.42 | $ 0.28 | $ 1.11 | $ 0.39
Net income per share, diluted (in dollars per share) | $ 0.41 | $ 0.26 | $ 1.05 | $ 0.37
ASU 2014-09 | Adjustments Due to the Adoption of Topic 606 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | $ 32,558 |  | $ 9,809 |
Income before income taxes | 32,558 |  | 9,809 |
Provision for income taxes | 680 |  | 566 |
Net income | $ 31,878 |  | $ 9,243 |
Net income per share, basic (in dollars per share) | $ 0.11 |  | $ 0.03 |
Net income per share, diluted (in dollars per share) | $ 0.10 |  | $ 0.03 |
ASU 2016-02 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Selling, general and administrative expenses | $ 936 |  | $ 936 |
Total operating expenses | 936 |  | 936 |
Interest expense | 348 |  | 348 |
Total other income, net | 348 |  | 348 |
Income before income taxes | (588) |  | (588) |
Provision for income taxes | (2) |  | (2) |
Net income | $ (586) |  | $ (586) |
Net income per share, basic (in dollars per share) | $ 0.00 |  | $ 0.00 |
Net income per share, diluted (in dollars per share) | $ 0.00 |  | $ 0.00 |
Balances Without the Adoption of Topic 606 or 842 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | $ 192,839 |  | $ 615,415 |
Selling, general and administrative expenses | 47,184 |  | 153,053 |
Total operating expenses | 99,285 |  | 297,035 |
Interest expense | (349) |  | (349) |
Total other income, net | 3,430 |  | 8,119 |
Income before income taxes | 96,984 |  | 326,499 |
Provision for income taxes | 1,646 |  | 5,175 |
Net income | $ 95,338 |  | $ 321,324 |
Net income per share, basic (in dollars per share) | $ 0.32 |  | $ 1.08 |
Net income per share, diluted (in dollars per share) | $ 0.31 |  | $ 1.03 |
Collaboration Revenues |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | $ 62,451 | $ 56,094 | $ 182,170 | $ 79,108
Collaboration Revenues | Balances Without the Adoption of Topic 606 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | 29,893 |  | 172,361 |
Collaboration Revenues | ASU 2014-09 | Adjustments Due to the Adoption of Topic 606 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | $ 32,558 |  | $ 9,809 |

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