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COMMON STOCK (Details) - shares	Mar. 27, 2022	Dec. 26, 2021
Class of Stock [Line Items]
Total reserved shares of common stock	38,208,097	38,660,730
Shares available for future issuance under the 2019 Equity Incentive Plan and 2021 Equity Incentive Plan
Class of Stock [Line Items]
Total reserved shares of common stock	11,392,585	12,159,177
Shares reserved for achievement of Spyce milestones
Class of Stock [Line Items]
Total reserved shares of common stock	714,285	714,285
Stock Options
Class of Stock [Line Items]
Total reserved shares of common stock	13,924,612	13,773,414
Employee Stock
Class of Stock [Line Items]
Total reserved shares of common stock	3,000,000	3,000,000
Restricted Stock Units And Performance Share Units
Class of Stock [Line Items]
Total reserved shares of common stock	9,176,615	9,013,854

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Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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