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Organization and Summary of Significant Accounting Policies - Impact of Adoption of Topic 606 and Topic 842 on the Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 28, 2018 | Dec. 30, 2017 | Dec. 29, 2017
--- | --- | --- | ---
Contract assets: unbilled collaboration revenue, gross: |  |  |  |
Current portion | $ 24,489 | $ 9,588 | $ 0 | [1]
Long-term portion | 0 | 12,247 |  |
Trade and other receivables | 104,634 | 88,935 | 81,192 | [1]
Property and equipment, net | 51,046 | 11,213 | 25,743 | [1]
Operating lease right-of-use assets | 5,989 | 8,579 | 0 | [1]
Contract liabilities: deferred revenue, gross: |  |  |  |
Current portion | 0 | 8,393 | 31,984 | [1]
Current portion | 2,268 | 25,441 | 238,520 | [1]
Other current liabilities | 15,900 | 19,323 | 16,150 | [1]
Long-term portion of lease liabilities | 14,983 | 13,324 |  |
Other long-term liabilities | 2,607 | 1,705 | 2,113 | [1]
Accumulated deficit | $ (1,240,452) | (1,570,434) | (1,829,172) | [1]
Calculated under Guidance in Effect before Topic 606 |  |  |  |
Contract assets: unbilled collaboration revenue, gross: |  |  |  |
Current portion |  |  | 0 |
Long-term portion |  |  | 0 |
Trade and other receivables |  |  | 81,192 |
Property and equipment, net |  |  | 25,743 |
Operating lease right-of-use assets |  |  | 0 |
Contract liabilities: deferred revenue, gross: |  |  |  |
Current portion |  |  | 31,984 |
Current portion |  |  | 238,520 |
Other current liabilities |  |  | 16,150 |
Long-term portion of lease liabilities |  |  | 14,530 |
Other long-term liabilities |  |  | 2,113 |
Accumulated deficit |  |  | $ (1,829,172) |
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after 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 |  |
Restatement Adjustment | ASU 2016-02 |  |  |  |
Contract assets: unbilled collaboration revenue, gross: |  |  |  |
Trade and other receivables |  | 7,743 |  |
Property and equipment, net |  | (14,530) |  |
Operating lease right-of-use assets |  | 8,579 |  |
Contract liabilities: deferred revenue, gross: |  |  |  |
Other current liabilities |  | 3,173 |  |
Long-term portion of lease liabilities |  | (1,206) |  |
Other long-term liabilities |  | (408) |  |
Accumulated deficit |  | $ 233 |  |
[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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