Quantum Corporation Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

DEBT - Narrative (Details)

DEBT - Narrative (Details)						3 Months Ended			9 Months Ended
DEBT - Narrative (Details)	Sep. 23, 2025 USD ($) day $ / shares shares	Apr. 02, 2025 USD ($)	Aug. 31, 2024 USD ($) $ / shares shares	Aug. 14, 2024	Jun. 01, 2023 USD ($) $ / shares shares	Dec. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Aug. 13, 2025 USD ($)	May 05, 2025 USD ($)	Mar. 31, 2025 USD ($)	Aug. 13, 2024 USD ($)	Jul. 31, 2024 USD ($)	Jul. 11, 2024 $ / shares shares	Aug. 05, 2021 USD ($)
Debt Instrument
Borrowings of long-term debt, net of debt issuance costs									$ 45,046,000	$ 25,000,000
Borrowings of credit facility									71,625,000	311,135,000
Issuance of warrants							$ 25,420,000
Paid-in-kind interest									5,328,000	3,515,000
Loss on debt extinguishment						$ 28,946,000		$ 0	59,641,000	$ 3,003,000
Warrant liabilities						16,335,000	$ 23,895,000		$ 16,335,000				$ 0
Forbearance Warrant
Debt Instrument
Warrant exercise price (in dollars per share) \| $ / shares	$ 8.81
Class of warrant or right, exercise price of warrants or rights percentage	80.00%
Number of days volume weighted average price	7 days
July 2024 Warrants
Debt Instrument
Warrant exercise price (in dollars per share) \| $ / shares																$ 8.20
Warrants to purchase (in shares) \| shares																50,000
August 2024 Warrants
Debt Instrument
Issuance of warrants			$ 1,200,000
Forbearance Warrant
Debt Instrument
Warrants to purchase (in shares) \| shares	2,653,308
Class of warrant or right, common stock outstanding percentage									19.90%
Warrant liabilities	$ 20,000,000
Line of Credit
Debt Instrument
Debt extinguishment cost											$ 1,200,000
Convertible Note
Debt Instrument
Stated interest rate (as a percent)	10.00%
Long-term debt, term	3 years
Debt instrument, convertible, conversion price (in dollars per share) \| $ / shares	$ 10.00
Debt instrument, convertible, minimum reset price (in dollars per share) \| $ / shares	$ 4.00
Debt instrument, convertible, if-called conversion price percentage	80.00%
Debt instrument, convertible, threshold trading days \| day	20
Convertible Note \| Debt Instrument, Redemption, Period One
Debt Instrument
Debt instrument, convertible, mandatory exchange rate	20.00%
Convertible Note \| Debt Instrument, Redemption, Period Two
Debt Instrument
Debt instrument, convertible, mandatory exchange rate	20.00%
Convertible Note \| Debt Instrument, Redemption, Period Three
Debt Instrument
Debt instrument, convertible, mandatory exchange rate	30.00%
Term Loans
Debt Instrument
Loss on debt extinguishment						$ 31,000,000.0
Term Loans \| Senior Secured Debt
Debt Instrument
Line of credit facility, maximum borrowing amount			$ 26,300,000
Borrowings of long-term debt, net of debt issuance costs					$ 15,000,000
Debt issuance cost		$ 400,000			$ 900,000							$ 100,000
Stated interest rate (as a percent)			5.00%		9.00%
Warrants issued (in shares) \| shares			380,310
Warrant exercise price (in dollars per share) \| $ / shares			$ 6.20
Line of credit facility, maximum borrowing amount, net			$ 25,000,000
Borrowings of credit facility			10,500,000
Line of credit facility, remaining borrowing amount			15,800,000
Loss on debt extinguishment		$ (2,400,000)	$ 3,000,000
Term Loans \| Senior Secured Debt \| Covenant Period One
Debt Instrument
Stated interest rate (as a percent)			11.00%
Paid-in-kind interest rate margin (as a percent)			6.00%
Term Loans \| Senior Secured Debt \| Covenant Period Two
Debt Instrument
Stated interest rate (as a percent)			13.00%
Paid-in-kind interest rate margin (as a percent)			8.00%
Term Loans \| Senior Secured Debt \| Term Loan Warrant
Debt Instrument
Warrants issued (in shares) \| shares					62,500
Term Loans \| Senior Secured Debt \| July 2024 Warrants
Debt Instrument
Fair value of warrants															$ 400,000
Term Loans \| Senior Secured Debt \| August 2024 Warrants
Debt Instrument
Fair value of warrants			$ 2,000,000
Term Loans \| Senior Secured Debt \| SOFR
Debt Instrument
Variable rate (as a percent)					10.00%
Term Loans \| Senior Secured Debt \| SOFR \| Covenant Period One
Debt Instrument
Variable rate (as a percent)			12.00%
Term Loans \| Senior Secured Debt \| SOFR \| Covenant Period Two
Debt Instrument
Variable rate (as a percent)			14.00%
Term Loans \| Term Loans \| Term Loan Warrant
Debt Instrument
Warrant exercise price (in dollars per share) \| $ / shares					$ 20.00
2021 Term Loan \| Senior Secured Debt \| Covenant Period One
Debt Instrument
Paid-in-kind interest rate margin (as a percent)				3.75%
Debt instrument amortization rate (as a percent)				5.00%
Applicable margin rate, percent (as a percent)				9.75%
2021 Term Loan \| Senior Secured Debt \| Covenant Period Two
Debt Instrument
Paid-in-kind interest rate margin (as a percent)				3.75%
Applicable margin rate, percent (as a percent)				9.75%
Debt instrument, step-up fee, percent (as a percent)				1.00%
2021 Term Loan \| Senior Secured Debt \| Covenant Period Two \| Paid in Kind Threshold One
Debt Instrument
Debt instrument, net leverage ratio				4.00
2021 Term Loan \| Senior Secured Debt \| Covenant Period Two \| Paid in Kind Threshold Two
Debt Instrument
Debt instrument, net leverage ratio				3.50
2021 Term Loan \| Senior Secured Debt \| SOFR \| Covenant Period One
Debt Instrument
Variable rate (as a percent)				1.00%
2021 Term Loan \| Senior Secured Debt \| SOFR \| Covenant Period Two \| Minimum
Debt Instrument
Variable rate (as a percent)				2.00%
2021 Term Loan \| Senior Secured Debt \| ABR \| Covenant Period One
Debt Instrument
Variable rate (as a percent)				1.75%
2021 Term Loan \| Senior Secured Debt \| ABR \| Covenant Period Two
Debt Instrument
Variable rate (as a percent)				8.75%
2021 Term Loan \| Senior Secured Debt \| Federal Funds Rate \| Covenant Period One
Debt Instrument
Variable rate (as a percent)				0.50%
2021 Term Loan \| Senior Secured Debt \| Prime Rate \| Covenant Period One
Debt Instrument
Variable rate (as a percent)				8.75%
Initial Term Loan \| Senior Secured Debt \| August 2024 Warrants
Debt Instrument
Paid-in-kind interest			$ 500,000
Amended PNC Credit Facility
Debt Instrument
Debt covenant, proceeds retainable on settlement of debt	$ 15,000,000
Debt covenant, potential interest rate increase (percent)	2.00%
Line of Credit \| PNC Credit Facility
Debt Instrument
Line of credit facility, maximum borrowing amount																	$ 40,000,000
Debt issuance cost															$ 100,000
Line of Credit \| PNC Credit Facility \| Covenant Period One
Debt Instrument
Applicable margin rate, percent (as a percent)				4.75%
Line of Credit \| PNC Credit Facility \| Covenant Period Two
Debt Instrument
Applicable margin rate, percent (as a percent)				3.75%
Line of Credit \| PNC Credit Facility \| SOFR \| Covenant Period Two
Debt Instrument
Variable rate (as a percent)				1.00%
Line of Credit \| PNC Credit Facility \| Overnight Banking Fund Rate \| Covenant Period Two
Debt Instrument
Variable rate (as a percent)				0.50%
Amended PNC Credit Facility
Debt Instrument
Line of credit facility daily minimum liquidity														$ 10,000,000