FAIR VALUE MEASUREMENTS - Schedule of Company's Assets that are Measured at Fair Value (Details) - HCM II ACQUISITION CORP - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Assets
Money market mutual fund held in Trust Account	$ 242,642,972	$ 235,193,585
Liabilities:
Total forward purchase agreement liability	0
Level 1
Assets
Money market mutual fund held in Trust Account	$ 242,642,972	$ 235,193,585

Amount of investment in marketable security, classified as noncurrent.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Name:	us-gaap_MarketableSecuritiesNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant