Accretion of debt discount.

No definition available.

Name:	MGTI_AccretionOfDebtDiscount
Namespace Prefix:	MGTI_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fees payable to borrower.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Period Type:	duration

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

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- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

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- Definition

Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

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- Definition

Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.

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Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

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- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Balance Type:	credit
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Amount of increase (decrease) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Notes Payable (Details Narrative) (10-K) $ in Thousands																3 Months Ended		12 Months Ended
Notes Payable (Details Narrative) (10-K) $ in Thousands	Apr. 02, 2021 USD ($)	Apr. 01, 2021 USD ($)	Dec. 08, 2020 USD ($) $ / shares	Jul. 28, 2020 USD ($) shares	Apr. 16, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Jul. 15, 2019 shares	May 15, 2019 shares	May 10, 2019 USD ($)	Apr. 12, 2019 shares	Apr. 09, 2019 USD ($)	Jan. 28, 2019 USD ($)	Dec. 06, 2018 USD ($)	Jun. 01, 2018 USD ($)	May 23, 2018 USD ($)	Mar. 31, 2021 USD ($) $ / shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares
Vwap percentage of common stock										9.99%
Gain on extinguishment of debt																			$ 3,540
Current liabilities						$ 1,008										$ 1,998		1,777	1,008
Accretion of debt discount																62	$ 421	882	5,605
Change in fair value recognized in non-operating income (expense)																67		(309)
Subsequent Event [Member]
Debt forgiveness amount	$ 108
Shares Issued Upon Conversion [Member]
Unsecured promissory notes																		$ 0
Debt conversion, shares issued \| shares																		93,078,492
Debt conversion, amount																		$ 929
Preferred Stock [Member]
Stock issued during period shares \| shares							10			190
May 2018 Notes [Member]
Notes payable									$ 421
Vwap percentage of common stock									70.00%
Debt conversion, shares issued \| shares								10,568,087
June 2018 Note [Member]
Unsecured promissory notes				$ 0
Notes payable									$ 3,159
Maturity date of notes									Dec. 15, 2019
Vwap percentage of common stock									70.00%
Gain on extinguishment of debt																			$ 1,310
Debt conversion, shares issued \| shares				17,164,732
Beneficial ownership percentage										9.99%
Debt conversion, amount				$ 154
June 2018 Note [Member] \| Common Stock [Member]
Stock issued during period shares \| shares										17,500,000
June 2018 Note [Member] \| Preferred Stock [Member]
Stock issued during period shares \| shares										160
Preferred stock, par value \| $ / shares						$ 0.001													$ 0.001
Preferred stock, value						$ 10,000													$ 10,000
Preferred stock, shares outstanding \| shares																		115
PPP Loan [Member] \| Subsequent Event [Member]
Debt forgiveness amount		$ 108
PPP Loan [Member] \| Aquesta Bank [Member]
Unsecured promissory notes					$ 111
Maturity date of notes					Apr. 01, 2023
Debt instrument accrued interest rate					1.00%
Debt monthly payments					$ 6
Debt description					Not more than 40% of the forgiven amount may be used for non-payroll costs
Current liabilities																		$ 3
Non-current liabilities																		111
May 2018 Notes Amendment [Member]
Maturity date of notes											Aug. 15, 2019
Vwap percentage of common stock											70.00%
Fees payable to borrower											$ 50
Gain on extinguishment of debt																			127
June 2018 Note Third Amendment [Member]
Maturity date of notes												Oct. 01, 2019
Vwap percentage of common stock												70.00%
Fees payable to borrower												$ 527
Gain on extinguishment of debt																			991
June 2018 Note Amendment [Member]
Notes payable						$ 929													929
Maturity date of notes						Jun. 30, 2020
Fees payable to borrower						$ 84
Gain on extinguishment of debt						792
Debt discount						877													877
May 2018 Notes [Member]
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Notes payable															$ 700
Maturity date of notes															Mar. 23, 2019
Vwap percentage of common stock															70.00%
Fees payable to borrower															$ 121
Gain on extinguishment of debt																			320
June 2018 Note [Member]
Unsecured promissory notes						$ 929								$ 3,600				230	$ 929
Notes payable														$ 3,000
Maturity date of notes														Apr. 01, 2019
Vwap percentage of common stock														120.00%
December 2018 Note [Member]
Unsecured promissory notes													$ 598
Notes payable													$ 500
Maturity date of notes													May 06, 2019
Debt instrument accrued interest rate													8.00%
December 2020 Note [Member]
Notes payable			$ 230
Vwap percentage of common stock			70.00%
Debt discount			$ 200
Debt instrument accrued interest rate			8.00%
Amortization of debt discount			$ 30
Accretion of debt discount			230
Derivative liability			555													$ 313		246
Beneficial conversion feature			355
Interest expense, debt			$ 355
Change in fair value recognized in non-operating income (expense)																		$ 309
December 2020 Note [Member] \| Stock Prices [Member]
Debt instrument, measurement input \| $ / shares			0.027													0.075		0.04
December 2020 Note [Member] \| Conversion Price [Member]
Debt instrument, measurement input \| $ / shares			0.009													0.042		0.025
December 2020 Note [Member] \| Remaining Lives [Member]
Debt instrument, term			1 year													8 months 9 days		11 months 8 days
December 2020 Note [Member] \| Dividend Yields [Member]
Debt instrument, measurement input			0													0.00		0
December 2020 Note [Member] \| Risk Free Rates [Member]
Debt instrument, measurement input			0.10													0.0005		0.10
December 2020 Note [Member] \| Volatility [Member]
Debt instrument, measurement input			1.5855													2.3734		1.6736