STOCKHOLDERS' DEFICIT - Narrative (Details) - USD ($)										3 Months Ended		9 Months Ended	10 Months Ended	12 Months Ended		36 Months Ended
	Oct. 09, 2025	Jul. 02, 2025	Apr. 08, 2025	Jan. 29, 2025	Jan. 24, 2025	Sep. 24, 2024	Jul. 30, 2024	Feb. 12, 2024	Oct. 03, 2022	Sep. 30, 2025	Mar. 31, 2024	Sep. 30, 2025	Nov. 12, 2025	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2025	Aug. 14, 2024
Class of Stock [Line Items]
Common stock issuance upon exercise of prefunded warrant (in shares)															810,205
Issuance of warrants to advisor in connection with completion of merger											$ 4,866,000
Warrants issued (in shares)												0
Senior Notes | Senior Notes
Class of Stock [Line Items]
Interest rate										8.50%		8.50%		8.50%		8.50%
February 2024 Pre-Funded Warrant
Class of Stock [Line Items]
Warrants outstanding (in shares)								810,205
Issuance of warrants to advisor in connection with completion of merger								$ 2,000,000
Common Stock Warrant
Class of Stock [Line Items]
Issuance of warrants to advisor in connection with completion of merger								$ 2,800,000
Common Stock Purchase Agreement
Class of Stock [Line Items]
Maximum aggregate consideration to be received on transaction							$ 20,000,000
Sale of stock, period							36 months
Number of shares issued in transaction (in shares)						7,300,000				0		0		1,595,855
Net proceeds received														$ 4,300,000
At The Market Issuance Sales Agreement
Class of Stock [Line Items]
Maximum aggregate consideration to be received on transaction									$ 22,800,000
Number of shares issued in transaction (in shares)										0		0				4,167,463
Net proceeds received																$ 20,700,000
Underwriter compensation, percentage of gross stock sales									3.00%
Securities Purchase Agreement
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)								450,300
Net proceeds received								$ 6,000,000
Sale of stock, price (in dollars per share)								$ 4.76
Exercise price (in dollars per share)								$ 0.0001									$ 5.25
Warrant term								5 years
Number of securities called by warrants (in shares)																	1,260,505
Debt Exchange Agreements
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)												1,242,456
Total cumulative shares, maximum percentage allowed for issue					19.99%
Debt Exchange Agreements | Common Class A
Class of Stock [Line Items]
Stock issued during period, value, debt modification amendment fee		$ 200,000	$ 100,000	$ 1,400,000
Issuance of shares in connection with equity interest payment agreement (in shares)		131,937	90,954	752,742
Debt Exchange Agreements | Common Class A | Subsequent Event
Class of Stock [Line Items]
Stock issued during period, value, debt modification amendment fee	$ 200,000												$ 1,900,000
Issuance of shares in connection with equity interest payment agreement (in shares)	102,286												1,077,919
Debt Exchange Agreements | Senior Notes | Senior Notes
Class of Stock [Line Items]
Stock issued during period, value, debt modification amendment fee												$ 1,500,000
Cash received in exchange												2,700,000
Debt exchanged										$ 10,500,000		$ 10,500,000		$ 10,500,000		$ 10,500,000
Debt Exchange Agreements | Letter of Credit
Class of Stock [Line Items]
Interest rate					8.50%
Debt Exchange Agreements | Atlas Holdings LLC
Class of Stock [Line Items]
Letters of credit outstanding					$ 8,600,000