XML 67 R57.htm IDEA: XBRL DOCUMENT v3.24.3

Fair Value Measurements - Schedule of Warrant Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Warrant Liability [Roll Forward]
Fair value as of December 31, 2023			$ 67,622
Change in fair value of warrant liability	$ (8,219)	$ 3,362	45,579	$ 11,581
Exercise of warrants			(1)	$ 0
Fair value as of September 30, 2024	113,200		113,200
Public Warrants
Fair Value, Warrant Liability [Roll Forward]
Fair value as of December 31, 2023			34,028
Change in fair value of warrant liability			22,936
Exercise of warrants			(1)
Fair value as of September 30, 2024	56,963		56,963
Private Warrants
Fair Value, Warrant Liability [Roll Forward]
Fair value as of December 31, 2023			33,594
Change in fair value of warrant liability			22,643
Exercise of warrants			0
Fair value as of September 30, 2024	$ 56,237		$ 56,237

X

- Definition

Fair Value, Warrant Liability

+ References

No definition available.

+ Details

Name:	grnd_FairValueWarrantLiabilityRollForward
Namespace Prefix:	grnd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Warrant Liability, Fair Value Disclosure

+ References

No definition available.

+ Details

Name:	grnd_WarrantLiabilityFairValueDisclosure
Namespace Prefix:	grnd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 25
-Paragraph 13
-SubTopic 10
-Topic 480
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481766/480-10-25-13

+ Details

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

X

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

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

X

- Details

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

X

- Details

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