Cash, Cash Equivalents and Investments - Cash, Cash Equivalents and Short-Term Investments and Long-Term Investments (Detail) - USD ($) $ in Thousands	Jul. 03, 2021	Jan. 02, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 53,331	$ 49,530
Unrealized Holding Gains	12	38
Unrealized Holding Losses	3	0
Fair Value	53,340	49,568
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	32,856	29,341
Fair Value	32,856	29,341
Cash and Cash Equivalents \| Cash
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28,477	24,729
Fair Value	28,477	24,729
Cash and Cash Equivalents \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,379	3,612
Fair Value	4,379	3,612
Cash and Cash Equivalents \| Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		1,000
Fair Value		1,000
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,794	14,806
Unrealized Holding Gains	11	33
Unrealized Holding Losses		0
Fair Value	15,805	14,839
Short-term Investments \| Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,505	2,929
Unrealized Holding Gains	2	6
Unrealized Holding Losses		0
Fair Value	4,507	2,935
Short-term Investments \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	740	400
Fair Value	740	400
Short-term Investments \| U.S. treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,999	4,527
Unrealized Holding Gains	6	25
Unrealized Holding Losses		0
Fair Value	3,005	4,552
Short-term Investments \| Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,550	6,450
Unrealized Holding Gains	3	2
Unrealized Holding Losses		0
Fair Value	7,553	6,452
Short-term Investments \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		500
Unrealized Holding Gains		0
Unrealized Holding Losses		0
Fair Value		500
Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,681	5,383
Unrealized Holding Gains	1	5
Unrealized Holding Losses	3	0
Fair Value	4,679	5,388
Long-term Investments \| Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,020	3,474
Unrealized Holding Gains		4
Unrealized Holding Losses	1	0
Fair Value	2,019	3,478
Long-term Investments \| U.S. treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,161	1,409
Unrealized Holding Gains	1	1
Unrealized Holding Losses	1	0
Fair Value	2,161	1,410
Long-term Investments \| Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	500	500
Unrealized Holding Gains		0
Unrealized Holding Losses	1
Fair Value	$ 499	$ 500

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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-Publisher FASB
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-Topic 320
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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