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Financial Instruments and Fair Value Measurements - Changes in fair value of the Level 3 liabilities (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 25, 2021	Mar. 31, 2021
Changes in fair value of the Level 3 liabilities
Balance at beginning		$ 2,209
Fair value recognized upon the issuance of SAFE		8,942
Change in the fair value of the derivative liability		(1,063)
Balance at the end		10,088
Proceeds from simple agreements for future equity		8,942
SAFE
Changes in fair value of the Level 3 liabilities
Fair value recognized upon the issuance of SAFE		8,942
Balance at the end		8,942
Proceeds from simple agreements for future equity	$ 8,942
Derivative Liability.
Changes in fair value of the Level 3 liabilities
Balance at beginning		2,209
Change in the fair value of the derivative liability		(1,063)
Balance at the end		$ 1,146

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- Definition

The cash inflow from simple agreements for future equity ("SAFEs) entered into by the company during the period.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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