FAIR VALUE MEASUREMENTS - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Jan. 19, 2022 $ / shares	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt, conversion price (in dollars per share) | $ / shares			$ 8.00
Impairment of digital assets	$ (53,985)	$ 0
Gain from sales of digital assets	2,163	$ 30
Notes payable	923,731			$ 557,007
Level 3 | Estimate of Fair Value Measurement | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	238,600			184,700
Level 3 | Principal | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$ 238,900			$ 171,200
Secured Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt, valuation technique, ratio of minimum payoff at maturity to carry value	2
Convertible debt, valuation technique, stock appreciation percentage	60.00%
Convertible debt, conversion price, percentage of financing price	80.00%
Other Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt, valuation technique, ratio of minimum payoff at maturity to carry value	1
Convertible debt, conversion price, percentage of financing price	80.00%
Convertible debt, valuation technique, stock depreciation percentage	0.20
Blockfi
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt, conversion price, percentage of financing price			80.00%
Convertible debt, conversion price (in dollars per share) | $ / shares			$ 8.00