RELATED PARTY TRANSACTIONS - Implementation Agreement with Aston Martin (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 06, 2023	Dec. 31, 2023	Mar. 31, 2024
Related Party Transaction [Line Items]
Accounts receivable, net		$ 51,822	$ 126,930
Related Party
Related Party Transaction [Line Items]
Accounts receivable, net		35,526	84,884
Strategic Technology Arrangement | Related Party | Aston Martin Lagonda Global Holdings plc
Related Party Transaction [Line Items]
Minimum amount committed	$ 225,000
Aston Martin Lagonda Global Holdings plc | Strategic Technology Arrangement | Related Party
Related Party Transaction [Line Items]
Other liabilities		107,800	109,900
Aston Martin Lagonda Global Holdings plc | Strategic Technology Arrangement, Technology Access Fees | Related Party
Related Party Transaction [Line Items]
Number of shares received	28,352,273
Initial installment	$ 33,000
Fair value amount	73,200	81,500	60,800
Remaining amount	$ 99,000
Payment term	3 years
Aston Martin Lagonda Global Holdings plc | Strategic Technology Arrangement, Service Fees | Related Party
Related Party Transaction [Line Items]
Amount to receive	$ 10,000
Payment term	3 years
Related party transaction, amount of transaction		$ 1,600
Accounts receivable, net			$ 2,100