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Long-term Debt - Schedule of Long Term Debt (Details) (Parenthetical)			3 Months Ended
	Apr. 06, 2020	Mar. 24, 2020	Mar. 31, 2021
Delayed Draw Term Note [Member]
Debt maturity date			Mar. 31, 2022
12% Amended Senior Secured Note [Member]
Debt maturity date			Dec. 31, 2022
12% Amended Senior Secured Note [Member] | Delayed Draw Term Note [Member]
Debt maturity date		Mar. 31, 2021
Payroll Protection Program Loan [Member]
Debt maturity date	Apr. 06, 2022		Apr. 06, 2022

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

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

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=MVEN_DelayedDrawTermNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=MVEN_TwelvePercentageAmendedSeniorSecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=MVEN_PayrollProtectionProgramLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: