Loss Contingency, Damages Sought, Reduced Value

No definition available.

Name:	grnd_LossContingencyDamagesSoughtReducedValue
Namespace Prefix:	grnd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Loss Contingency, Escrow

+ References

No definition available.

+ Details

Name:	grnd_LossContingencyEscrow
Namespace Prefix:	grnd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

+ Details

Name:	us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

+ Details

Name:	us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of pending claims pertaining to a loss contingency.

+ References

+ Details

Name:	us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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

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

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=grnd_DatatilsynetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitment and Contingencies (Details) kr in Thousands, $ in Thousands		1 Months Ended
	Oct. 11, 2021 complaint	Dec. 31, 2021 NOK (kr)	Dec. 31, 2021 USD ($)	Jan. 31, 2021 NOK (kr)	Jan. 31, 2021 USD ($)	Nov. 14, 2022 USD ($)	Jan. 31, 2020 complaint
Other Commitments [Line Items]
Number of additional complaints filed	2
Escrow \| $						$ 6,500
Datatilsynet
Other Commitments [Line Items]
Number of complaints filed							3
Amount of administrative fine imposed				kr 100,000	$ 9,250
Reduced to administrative fine imposed		kr 65	$ 6,013