SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Jan. 23, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net income (loss)	$ 210,691	$ (388)
Cash and cash equivalents	98,125			$ 50,409
Working capital, net	5,200
Stockholders' deficit	318,509	397,461		596,941	$ 409,346
Digital assets	$ 0	0		2,284	724
Digital assets, period to sell after receipt of payment	10 days
Current and non-current deferred revenue balance	$ 9,300			9,800
Deferred revenue recognized	6,400	11,600
Change in fair value gain	(18,390)	$ 0
Cumulative Effect, Period of Adoption, Adjustment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Stockholders' deficit				(24)
Digital assets				$ 24	$ 0
Contingent value rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative warrant liabilities	44,600		$ 86,300
Change in fair value gain	41,700
GUC contingent value rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative warrant liabilities	44,600		86,300
Change in fair value gain	41,700
Warrants liability:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative warrant liabilities	327,500		$ 345,900
Change in fair value gain	18,400
Hosting revenue
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commitments not yet recognized	$ 58,300
Percentage of commitments expected to be recognized over next 12 months	89.00%
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contract with customer, term	15 months
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contract with customer, term	24 months