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Stock-based Compensation and Stockholders' Equity - Summary of Stock-based Compensation by Income Statement Line Item (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 29, 2021	Aug. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 620	$ 892
Cost of product sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	37	123
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	49	64
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 534	$ 705

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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-SubTopic 10
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+ References

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