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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	Mar. 30, 2018	Dec. 30, 2017	Dec. 29, 2017
Contract assets: unbilled collaboration revenue, gross:
Current portion	$ 31,844	$ 9,588	$ 9,588
Long-term portion	0	12,247	12,247
Contract liabilities: deferred revenue, gross:
Current portion	0	8,393	8,393
Long-term portion	3,177	25,441	25,441
Accumulated deficit	(1,454,810)	(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
Long-term portion			238,520
Accumulated deficit	(1,743,822)		(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)
Long-term portion			$ (213,079)
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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