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Organization and Summary of Significant Accounting Policies - Impact of Adoption of Topic 606 on Contract Assets, Contract Liabilities and Accumulated Deficit (Details) - USD ($) $ in Thousands | Jun. 29, 2018 | Dec. 30, 2017 | Dec. 29, 2017
--- | --- | --- | ---
Contract assets: unbilled collaboration revenue, gross: |  |  |  |
Current portion | $ 0 | $ 9,588 |  |
Long-term portion | 0 | 12,247 |  |
Contract liabilities: deferred revenue, gross: |  |  |  |
Current portion | 5,939 | 8,393 | $ 31,984 | [1]
Current portion | 11,970 | 25,441 | 238,520 | [1]
Accumulated deficit | $ (1,367,316) | (1,570,667) | (1,829,172) | [1]
Balances Without the Adoption of Topic 606 |  |  |  |
Contract assets: unbilled collaboration revenue, gross: |  |  |  |
Current portion |  |  | 0 |
Long-term portion |  |  | 0 |
Contract liabilities: deferred revenue, gross: |  |  |  |
Current portion |  |  | 31,984 |
Current portion |  |  | 238,520 |
Accumulated deficit |  |  | $ (1,829,172) |
ASU 2014-09 | Adjustments Due to the Adoption of Topic 606 |  |  |  |
Contract assets: unbilled collaboration revenue, gross: |  |  |  |
Current portion |  | 9,588 |  |
Long-term portion |  | 12,247 |  |
Contract liabilities: deferred revenue, gross: |  |  |  |
Current portion |  | (23,591) |  |
Current portion |  | (213,079) |  |
Accumulated deficit |  | $ 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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