SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	May 31, 2026	Jan. 31, 2026	Dec. 31, 2025	Aug. 31, 2025
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and development, net		$ 6,582	$ 6,745	$ 8,524	$ 13,499
Common stock, par value (in usd per share)						$ 0.00001
Related Party
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and development, net		$ 10	140	$ 10	165
Series A Common stock
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Common stock, par value (in usd per share)		$ 0.00001		$ 0.00001				$ 0.00001
Convertible Promissory Notes \| Related Party
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Face amount									$ 10,000
Convertible Promissory Notes \| Nonrelated Party
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Face amount							$ 5,300
Public Warrants
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Warrants outstanding (in shares)		13,800,000		13,800,000
Warrants for Series A
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Warrants outstanding (in shares)		6,800,000		6,800,000
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and development, net		$ 200	$ 200	$ 3,600	$ 200
PowerCo SE (“PowerCo”) \| Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborative agreement term	15 months
Noteholder \| Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Consideration for performance							900
Noteholder \| Collaborative Arrangement, Transaction with Party to Collaborative Arrangement \| Nonrelated Party
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Consideration for performance							$ 900