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Cash, cash equivalents and short-term investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 30, 2016
Fair Value Measurements [Line Items]
Amortized Cost	$ 162,233	$ 173,967
Unrealized Gains	0	0
Unrealized Losses	(237)	(245)
Estimated Fair Value	161,996	173,722
U.S. agency securities
Fair Value Measurements [Line Items]
Amortized Cost	72,000	59,000
Unrealized Gains	0	0
Unrealized Losses	(237)	(245)
Estimated Fair Value	71,763	58,755
Cash
Fair Value Measurements [Line Items]
Amortized Cost	80,974	93,049
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	80,974	93,049
Money market securities
Fair Value Measurements [Line Items]
Amortized Cost	9,259	21,918
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	9,259	21,918
Total cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	9,259	21,918
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	9,259	21,918
Total cash and cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	90,233	114,967
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	90,233	114,967
Total short-term investments
Fair Value Measurements [Line Items]
Amortized Cost	72,000	59,000
Unrealized Gains	0	0
Unrealized Losses	(237)	(245)
Estimated Fair Value	$ 71,763	$ 58,755

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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