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Organization and Summary of Significant Accounting Policies - Impact of Adoption of Topic 606 on the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Mar. 30, 2018 | Dec. 30, 2017 | Dec. 29, 2017
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Unbilled collaboration revenue | $ 31,844 |  | $ 0 | [1]
Current portion of deferred revenue | 0 |  | 31,984 | [1]
Other current liabilities | 17,711 |  | 16,150 | [1]
Long-term portion of deferred revenue | 3,177 |  | 238,520 | [1]
Accumulated deficit | (1,454,810) | $ (1,570,667) | (1,829,172) | [1]
Balances Without the Adoption of Topic 606 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Unbilled collaboration revenue | 0 |  |  |
Current portion of deferred revenue | 30,288 |  |  |
Other current liabilities | 16,820 |  |  |
Long-term portion of deferred revenue | 230,948 |  |  |
Accumulated deficit | (1,743,822) |  | $ (1,829,172) |
ASU 2014-09 | Effect of Adoption Higher / (Lower) |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Unbilled collaboration revenue | 31,844 |  |  |
Current portion of deferred revenue | (30,288) |  |  |
Other current liabilities | 891 |  |  |
Long-term portion of deferred revenue | (227,771) |  |  |
Accumulated deficit | $ 289,012 | $ 258,505 |  |
[1] | The Condensed Consolidated Balance Sheet as of December 31, 2017 has been derived from the audited financial statements as of that date.

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