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RELATED PARTY TRANSACTIONS - Related Party Note Receivable (Details) - Related Party - Transition Services Agreement - Mullen Technologies, Inc. $ in Thousands			3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($)	Nov. 05, 2021 employee	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)
Related Party Transaction [Line Items]
Number of employees that provided services only to related party | employee		11
Disbursements on behalf of related party			$ 2,500	$ 2,100
Penalties and interest			$ 238	$ 179
Conversion of accounts receivable to note receivable	$ 1,400
Related party transaction rate	10.00%
Default rate (as a percent)	15.00%
Increase in principal amount of notes receivable	$ 400
Prime rate
Related Party Transaction [Line Items]
Spread on variable rate of advance receivable (as a percent)		1.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section S99
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