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Revenues - Contract Assets and Liabilities under Topic 606 (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Sep. 27, 2019 | Sep. 28, 2018 | Dec. 28, 2018
Revenue from Contract with Customer [Abstract] |  |  |  |  |  |
Unbilled collaboration revenue | $ 0 |  | $ 0 |  | $ 0 |
Deferred revenue | 15,399 |  | 15,399 |  | $ 15,897 | [1]
Amount of revenues recognized included in the beginning contract liability balance |  |  | 2,700 | $ 6,100 |  |
Revenues recognized for performance obligations satisfied in previous periods | $ 67,700 | $ 48,200 | $ 129,000 | $ 151,800 |  |
[1] | The Condensed Consolidated Balance Sheet as of December 31, 2018 has been derived from the audited financial statements as of that date.

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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