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Fair Value Measurements - Schedule of Warrant Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value of Warrant Liability [Roll Forward]
Fair value as of December 31, 2024			$ 252,178
Change in fair value of warrant liability	$ 0	$ (8,219)	(9,905)	$ 45,579
Exercise and redemption of Warrants			(242,273)
Fair value as of September 30, 2025	$ 0		$ 0

X

- Definition

Fair value of warrant liability

+ References

No definition available.

+ Details

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X

- Definition

Proceeds From Warrant Exercises, Net Of Payments For Repurchases Of Warrants

+ References

No definition available.

+ Details

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- Definition

Warrant Liability, Fair Value Disclosure

+ References

No definition available.

+ Details

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Namespace Prefix:	grnd_
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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

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