Quantum Corporation Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

DEBT - Narrative (Details)

DEBT - Narrative (Details)						1 Months Ended		3 Months Ended	12 Months Ended
DEBT - Narrative (Details)	Mar. 31, 2020 USD ($)	Nov. 18, 2019 shares	Dec. 27, 2018 USD ($) $ / shares shares	Aug. 01, 2018 USD ($) $ / shares shares	Feb. 01, 2018 USD ($) day $ / shares shares	Dec. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Jun. 30, 2019	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Feb. 01, 2019 $ / shares	Dec. 28, 2018 USD ($)	Nov. 30, 2018 $ / shares shares	Oct. 31, 2018 $ / shares shares	Sep. 30, 2018 $ / shares shares
Debt Instrument [Line Items]
Loss on debt extinguishment, net					$ 800,000				$ 0	$ (17,458,000)	$ (6,934,000)
Debt discount					100,000
Debt extinguishment fees					700,000
Line of credit facility, maximum borrowing amount			$ 45,000,000.0
Warrants issued during the period (in shares) \| shares		3,800,000
Debt issuance fees					$ 1,400,000
Aggregate principal amount													$ 150,000,000
Interest payments made in kind									$ 1,858,000	0	0
Federal funds rate
Debt Instrument [Line Items]
Interest rate			0.50%
One month LIBOR
Debt Instrument [Line Items]
Interest rate			1.00%
Base rate
Debt Instrument [Line Items]
Interest rate			3.00%
LIBOR rate plus senior net leverage ratio
Debt Instrument [Line Items]
Interest rate			10.00%
Prime rate quoted by the Wall Street Journal
Debt Instrument [Line Items]
Interest rate			9.00%
PNC credit facility
Debt Instrument [Line Items]
Interest rate during period									6.25%
Restricted cash reserve	$ 5,000,000								$ 5,000,000
Notes payable to banks \| Federal funds rate
Debt Instrument [Line Items]
Interest rate									0.50%
Notes payable to banks \| One month LIBOR
Debt Instrument [Line Items]
Interest rate									1.00%
Notes payable to banks \| Base rate
Debt Instrument [Line Items]
Interest rate									3.00%
Senior secured term loan
Debt Instrument [Line Items]
Interest rate								5.00%
Proceeds of senior secured term loan			$ 15,000,000
Percentage of principal payments of the senior secured term loan			0.25%
Senior secured term loan \| Minimum
Debt Instrument [Line Items]
Interest rate								3.50%
Senior secured term loan \| Maximum
Debt Instrument [Line Items]
Interest rate								4.50%
Senior secured term loan \| PNC credit facility
Debt Instrument [Line Items]
Interest rate								4.50%
Senior secured term loan \| PNC credit facility \| Minimum
Debt Instrument [Line Items]
Interest rate								4.50%
Senior secured term loan \| PNC credit facility \| Maximum
Debt Instrument [Line Items]
Interest rate								5.00%
Senior secured term loan \| PNC credit facility \| Base rate
Debt Instrument [Line Items]
Interest rate								0.50%
Senior secured term loan \| PNC credit facility \| LIBOR rate plus senior net leverage ratio
Debt Instrument [Line Items]
Interest rate								1.00%
Senior secured term loan \| Senior secured term loan and amended PNC credit facility
Debt Instrument [Line Items]
Warrants issued (in shares) \| shares			7,110,616
Warrant exercise price (in dollars per share) \| $ / shares			$ 1.33
Debt issuance fees			$ 18,300,000
Fair value of warrants classified within stockholders deficit			8,800,000
TWC term loan agreement \| LIBOR rate plus senior net leverage ratio \| Minimum
Debt Instrument [Line Items]
Interest rate									7.00%
TWC term loan agreement \| LIBOR rate plus senior net leverage ratio \| Maximum
Debt Instrument [Line Items]
Interest rate									8.25%
TWC term loan agreement \| Prime rate quoted by the Wall Street Journal \| Minimum
Debt Instrument [Line Items]
Interest rate									6.00%
TWC term loan agreement \| Prime rate quoted by the Wall Street Journal \| Maximum
Debt Instrument [Line Items]
Interest rate									7.25%
Revolving credit agreement \| Federal funds rate
Debt Instrument [Line Items]
Interest rate									0.50%
Revolving credit agreement \| One month LIBOR
Debt Instrument [Line Items]
Interest rate									1.00%
Revolving credit agreement \| One month LIBOR margin \| Minimum
Debt Instrument [Line Items]
Interest rate									1.50%
Revolving credit agreement \| One month LIBOR margin \| Maximum
Debt Instrument [Line Items]
Interest rate									2.50%
Senior secured term loan, ECF payment
Debt Instrument [Line Items]
Current debt payable	5,300,000								$ 5,300,000
Senior secured term loan
Debt Instrument [Line Items]
Aggregate principal amount	$ 165,208,000								$ 165,208,000	$ 164,588,000
Prepayment percentage									25.00%
Percentage of principal to be repaid upon change in control of interest	1.00%								1.00%
Prepayment penalty period									30 months
Deferred scheduled amortization payments	$ 400,000
Interest payments made in kind	1,900,000
Interest rate during period									12.00%
Senior secured term loan \| LIBOR
Debt Instrument [Line Items]
Interest rate									10.00%
Senior secured term loan \| Principal Prepaid Amount
Debt Instrument [Line Items]
Interest rate									5.00%
December 2018 Credit Agreements
Debt Instrument [Line Items]
Prepayment percentage						100.00%
Debt default trigger amount						$ 1,000,000.0
Prepayment premium percentage									12.00%
Registration rights agreement \| Senior secured term loan
Debt Instrument [Line Items]
Registration delay payments	$ 300,000								$ 300,000
Registration delay payments interest rate	5.00%								5.00%
February 2018 amendment \| TWC term loan agreement
Debt Instrument [Line Items]
Percentage of interest on debt in kind							2.00%
Decrease in restricted cash							$ 7,000,000
Warrants issued (in shares) \| shares					150,000
Warrant exercise price (in dollars per share) \| $ / shares					$ 0.01
Warrants exercised (in shares) \| shares					75,000
Loss on debt extinguishment, net											6,900,000
Debt discount											3,800,000
Debt extinguishment fees											3,100,000
August 2018 amendment
Debt Instrument [Line Items]
Warrants issued (in shares) \| shares				1,099,533
Warrant exercise price (in dollars per share) \| $ / shares				$ 2.11								$ 1.62		$ 2.40	$ 2.39	$ 2.40
Percent of common stock to purchase				3.00%
Trading days \| day					5
Fair value of warrants issued				$ 5,600,000
Amount borrowed				$ 6,700,000.0
Total warrants issued (in shares) \| shares				4,398,132
Warrants called in period (in shares) \| shares														1,099,533	1,099,533	1,099,533
Loss from repurchase of warrants				$ 400,000
Repurchase right percentage				50.00%
Warrant repurchase price (in dollars per share) \| $ / shares				$ 0.001
Warrants repurchased, value				$ 550
Warrants repurchased (in shares) \| shares				549,766
August 2018 amendment \| Additional incremental delayed term loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing amount				$ 20,000,000
August 2018 amendment \| PNC credit facility
Debt Instrument [Line Items]
Loss on debt extinguishment, net											1,800,000
Debt issuance fees											1,700,000
August 2018 amendment \| TWC term loan agreement
Debt Instrument [Line Items]
Loss on debt extinguishment, net											14,900,000
Debt issuance fees											5,700,000
Non contingent warrants \| February 2018 amendment \| TWC term loan agreement
Debt Instrument [Line Items]
Warrants issued (in shares) \| shares					75,000
Fair value of warrants issued					$ 300,000
Remaining contingent warrants \| February 2018 amendment \| TWC term loan agreement
Debt Instrument [Line Items]
Warrants issued (in shares) \| shares					75,000
Fair value of warrants issued					$ 300,000
Warrant \| February 2018 amendment \| TWC term loan agreement
Debt Instrument [Line Items]
Fair value of warrants amended					$ 600,000
Debt extinguishment fees											600,000
Warrant \| Operating expenses \| August 2018 amendment
Debt Instrument [Line Items]
Loss from repurchase of warrants				$ 400,000
Other current assets \| Interest expense \| February 2018 amendment \| PNC credit facility
Debt Instrument [Line Items]
Debt extinguishment fees											$ 600,000
Accounting Standards Update 2017-11 \| Warrant \| Senior secured term loan \| Senior secured term loan and amended PNC credit facility
Debt Instrument [Line Items]
Fair value of warrants classified within stockholders deficit			$ 8,800,000
Common Stock
Debt Instrument [Line Items]
Warrants issued during the period (in shares) \| shares		2,800,000
Covenant Period One \| Senior secured term loan
Debt Instrument [Line Items]
Prepayment penalty percentage									5.00%
Covenant Period Two \| Senior secured term loan
Debt Instrument [Line Items]
Prepayment penalty percentage									2.00%