XML 66 R56.htm IDEA: XBRL DOCUMENT
v3.26.1

Fair Value Measurements - Schedule of Warrant Liability (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Fair Value of Warrant Liability [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ 0 | $ 252,178 | $ 252,178
Change in fair value of warrant liability | $ 0 | $ 0 | $ 0 | $ (9,905) | (9,905)
Exercise and redemption of Warrants |  |  |  |  | (242,273)
Ending balance |  |  |  |  | $ 0

X
- Definition Fair value of warrant liability + References No definition available. + Details
Name: | grnd_FairValueOfWarrantLiabilityRollForward
Namespace Prefix: | grnd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds From Warrant Exercises, Net Of Payments For Repurchases Of Warrants + References No definition available. + Details
Name: | grnd_ProceedsFromWarrantExercisesNetOfPaymentsForRepurchasesOfWarrants
Namespace Prefix: | grnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 + Details
Name: | us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration