Class of warrant or right date from which warrants or rights are issued.

No definition available.

Name:	grna_ClassOfWarrantOrRightDateFromWhichWarrantsOrRightsAreIssued
Namespace Prefix:	grna_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313

+ Details

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=grna_PrivatePlacementWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=grna_CommonStockWarrantClassifiedAsLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=grna_CommonStockWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=grna_GreenlightBiosciencesHoldingsPbcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=grna_CommonStockWarrantsClassifiedAsEquityMember
Namespace Prefix:
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Warrants - Summary of Common Stock Warrant Classified (Details) - USD ($)	Feb. 02, 2022	Jan. 19, 2022	Mar. 31, 2022
Private Placement Warrants [Member]
Class of Warrant or Right [Line Items]
Exercise Price	$ 11.50
Common Stock Warrant Classified as Liability [Member] \| Common Stock Warrant [Member]
Class of Warrant or Right [Line Items]
Exercise Price		$ 5.89	$ 9.63
Common Stock Warrant Classified as Liability [Member] \| Common Stock Warrant [Member] \| GREENLIGHT BIOSCIENCES HOLDINGS, PBC [Member]
Class of Warrant or Right [Line Items]
Shares		28,517
Fair Value		$ 249
Issuance Date		Jan. 19, 2022
Exercise Price		$ 5.26
Expiration Date		Mar. 29, 2031
Common Stock Warrant Classified as Liability [Member] \| Private Placement Warrants [Member]
Class of Warrant or Right [Line Items]
Shares	2,062,500		2,062,500
Exercise Price	$ 8.82		$ 9.63
Common Stock Warrant Classified as Liability [Member] \| Private Placement Warrants [Member] \| GREENLIGHT BIOSCIENCES HOLDINGS, PBC [Member]
Class of Warrant or Right [Line Items]
Shares	2,062,500
Fair Value	$ 1,341
Issuance Date	Feb. 02, 2022
Exercise Price	$ 11.50
Expiration Date	Mar. 02, 2027
Common Stock Warrants Classified As Equity [Member] \| Common Stock Warrant [Member]
Class of Warrant or Right [Line Items]
Exercise Price		$ 5.89
Common Stock Warrants Classified As Equity [Member] \| Common Stock Warrant [Member] \| GREENLIGHT BIOSCIENCES HOLDINGS, PBC [Member]
Class of Warrant or Right [Line Items]
Shares		85,552
Issuance Date		Jan. 19, 2022
Exercise Price		$ 5.26
Expiration Date		Jan. 19, 2032