The amount of increase (decrease) during the reporting period in the orbital receivables for expected orbital payments.

No definition available.

Name:	maxr_IncreaseDecreaseInOutstandingReceivablesForExpectedOrbitalPayments
Namespace Prefix:	maxr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of increase (decrease) during the reporting period in the orbital receivables for expected orbital payments.

+ References

No definition available.

+ Details

Name:	maxr_IncreaseDecreaseInOutstandingReceivablesForFinalMilestone
Namespace Prefix:	maxr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the number of customers.

+ References

No definition available.

+ Details

Name:	maxr_NumberOfCustomers
Namespace Prefix:	maxr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of non current portion of orbital receivables.

+ References

No definition available.

+ Details

Name:	maxr_OrbitalReceivablesNoncurrent
Namespace Prefix:	maxr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-SubTopic 10
-Section 50
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+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

+ Details

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

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

+ Details

Name:	us-gaap_ProvisionForLoanLeaseAndOtherLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CreditConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=maxr_LargestCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Trade and other receivables - Orbital receivables (Details) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended	21 Months Ended
	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($) customer
Trade and other receivables
Reduction in outstanding receivables, final milestone	$ 15.0
Reduction in outstanding receivables, expected orbital payments	14.0
Orbital receivables, net		$ 324.0	$ 361.0	$ 324.0
Changes in allowance for expected credit losses related to non-current orbital receivables
Allowance at the beginning of the period	$ (49.0)	(49.0)
Additions		0.0
Allowance at the end of the period		$ (49.0)	$ (49.0)	$ (49.0)
Accounts Receivable \| Credit Concentration Risk
Trade and other receivables
Number of customers \| customer				13
Accounts Receivable \| Credit Concentration Risk \| Largest Customer
Trade and other receivables
Concentration risk, percentage		21.00%	19.00%