SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)					1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended	13 Months Ended	15 Months Ended
	Nov. 09, 2023 USD ($) a	Jun. 20, 2023 USD ($)	Jan. 30, 2023 USD ($)	Dec. 20, 2022 USD ($)	Mar. 31, 2023 miner	Sep. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($) bitcoin	Dec. 31, 2022 USD ($)	Nov. 10, 2023 USD ($) shares	Jun. 30, 2023 USD ($)	Nov. 08, 2023 USD ($)	Aug. 31, 2023 MW	Aug. 10, 2023 a	Dec. 31, 2021 USD ($)
Short-Term Debt [Line Items]
Cash, restricted cash and cash equivalents						$ 10,687,000			$ 10,687,000	$ 38,513,000	$ 15,217,000						$ 82,599,000
Accounts payable and accrued expenses						29,600,000			29,600,000
Short-term environmental liability						1,700,000			1,700,000		600,000
Accrued interest						$ 1,530,000			1,530,000		$ 1,741,000
Facilities owned and operated, associated power in facility (in megawatt) | MW															44
Facilities owned and operated, land to be sold (in acres) | a																22
Proceeds from sale of assets									600,000	$ 4,802,000			$ 11,700,000
Number of additional miners installed | miner					1,500
Hosting agreement, period			5 years
Impairment of digital assets							$ 100,000	$ 100,000	$ 0
Number of digital assets (in bitcoin) | bitcoin										29.0
Subsequent Event
Short-Term Debt [Line Items]
Accrued interest	$ 6,100,000
Subsequent Event | Land | South Carolina, United States
Short-Term Debt [Line Items]
Land to remain with entity after sale (in acres) | a	153
Subsequent Event | South Carolina Datacenter | Discontinued Operations, Disposed of by Sale
Short-Term Debt [Line Items]
Facilities owned and operated, land sold (in acres) | a	22
Proceeds from facility and land sold	$ 28,000,000
Cash acquired from disposal	4,500,000
Bonus receivable	1,600,000
Liabilities settlement amount	2,200,000
Return of security deposit	$ 3,500,000
Return of security deposit, period	30 days
Third-party and tax settlement amount	$ 500,000
Settlement of accounts payable related to the facility upgrade														$ 900,000
Minimum
Short-Term Debt [Line Items]
Decrease in price of bitcoin											0.64
Increase in price of natural gas											0.47
Maximum
Short-Term Debt [Line Items]
Decrease in price of bitcoin											0.66
Increase in price of natural gas											1.60
Refinanced 2021 and 2022 Master Equipment Finance Agreement | Secured Debt
Short-Term Debt [Line Items]
Remaining principal balance, interest payments			$ 2,000,000
Principal payments plus interest payments on debt			62,700,000
Senior Notes Due January 2025 And Secured Promissory Note | Subsequent Event | South Carolina Datacenter | Discontinued Operations, Disposed of by Sale
Short-Term Debt [Line Items]
Interest payment	900,000
Senior Secured Loan | Senior Notes | Subsequent Event | South Carolina Datacenter | Discontinued Operations, Disposed of by Sale
Short-Term Debt [Line Items]
Extinguishment of debt	17,700,000
Secured Promissory Note | Secured Debt
Short-Term Debt [Line Items]
Principal payments plus interest payments on debt		$ 1,500,000	$ 0	$ 1,500,000
Secured Promissory Note | Subsequent Event | Secured Debt | South Carolina Datacenter | Discontinued Operations, Disposed of by Sale
Short-Term Debt [Line Items]
Extinguishment of debt	$ 4,100,000
At The Market Issuance Sales Agreement
Short-Term Debt [Line Items]
Number of shares issued in transaction | shares						73,825			2,583,631
Net proceeds received						$ 400,000			$ 11,700,000
At The Market Issuance Sales Agreement | Subsequent Event
Short-Term Debt [Line Items]
Number of shares issued in transaction | shares												2,920,816
Net proceeds received												$ 14,000,000