FAIR VALUE MEASURES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Jun. 30, 2026	Jun. 05, 2026
Convertible Promissory Notes \| Related Party
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Converted instrument, issue (in usd per share)			$ 10.42
Convertible Promissory Notes \| Nonrelated Party
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Converted instrument, issue (in usd per share)			10.06
Series A Common stock \| Convertible Promissory Notes \| Related Party
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Converted instrument, issue (in usd per share)			10.42
Series A Common stock \| Convertible Promissory Notes \| Nonrelated Party
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Converted instrument, issue (in usd per share)			10.06
Series B-1 and Series D redeemable convertible preferred stock warrants \| Series A Common stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Converted instrument, issue (in usd per share)			$ 10.42
Warrants for Series A \| Warrant Liabilities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value outstanding	$ 0	$ 44,616
Valuation Technique, SPAC Exit Scenario
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Valuation approach and technique concentration (in percent)	75.00%
Valuation Technique, Option Pricing Model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Valuation approach and technique concentration (in percent)	25.00%