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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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