Name:	mrna_ChangeInFairValueLiabilityForPriceAdjustableWarrantsAndSubscriptionInvestmentUnits
Namespace Prefix:	mrna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

No definition available.

Name:	mrna_ContractualLifeInYearsRollForward
Namespace Prefix:	mrna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	mrna_ExercisePriceRollForward
Namespace Prefix:	mrna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Risk-free rate assumption used in valuing an instrument.

No definition available.

Name:	mrna_FairValueAssumptionsRiskFreeRate
Namespace Prefix:	mrna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Period the asset or liability is expected to be outstanding.

No definition available.

Name:	mrna_FairValueAssumptionsTerm
Namespace Prefix:	mrna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Measure, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

No definition available.

Name:	mrna_FairValueAssumptionsVolatility
Namespace Prefix:	mrna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Fair value of the warrants exercised.

No definition available.

Name:	mrna_FairValueOfPerWarrantExercised
Namespace Prefix:	mrna_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Fair value of the warrants exercised, term.

No definition available.

Name:	mrna_FairValueOfWarrantExercisedTerm
Namespace Prefix:	mrna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the fair value of warrants exercised.

No definition available.

Name:	mrna_FairValueOfWarrantsExercised
Namespace Prefix:	mrna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Fair value of the warrants exercised, risk free rate.

No definition available.

Name:	mrna_FairValueOfWarrantsExercisedRiskFree
Namespace Prefix:	mrna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the fair value of warrants exercised, stock price.

No definition available.

Name:	mrna_FairValueOfWarrantsExercisedStockPrice
Namespace Prefix:	mrna_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Represents the fair value of warrants exercised, volatility.

No definition available.

Name:	mrna_FairValueOfWarrantsExercisedVolatility
Namespace Prefix:	mrna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	mrna_RiskFreeRollForward
Namespace Prefix:	mrna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	mrna_StockPriceRollForward
Namespace Prefix:	mrna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	mrna_VolatilityRollForward
Namespace Prefix:	mrna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the value of warrant issuance in connection with Series C.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesC
Namespace Prefix:	mrna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the warrant issuance in connection with series C contractual life.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesCContractualLife
Namespace Prefix:	mrna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the warrant issuance in connection with series C exercise price.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesCExercisePrice
Namespace Prefix:	mrna_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of warrant issuance in connection with series C risk free rate.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesCRiskFreeRate
Namespace Prefix:	mrna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the warrant issuance in connection with series C stock price.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesCStockPrice
Namespace Prefix:	mrna_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of warrant issuance in connection with series C volatility.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesCVolatility
Namespace Prefix:	mrna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

This element represents amount of fair value of price-adjustable warrants issued in connection with Series D convertible preferred shares.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesD
Namespace Prefix:	mrna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents period of warrant issuance in connection with Series D contractual life.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesDContractualLife
Namespace Prefix:	mrna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

This element represents warrant issuance in connection with series d exercise price.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesDExercisePrice
Namespace Prefix:	mrna_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

This element represents percentage of warrant issuance in Connection with series D risk free rate.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesDRiskFreeRate
Namespace Prefix:	mrna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

This element represents percentage of warrant issuance in connection with series D volatility.

No definition available.

Name:	mrna_WarrantIssuanceInConnectionWithSeriesDVolatility
Namespace Prefix:	mrna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Agreed upon price for the exchange of the underlying asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

Name:	us-gaap_FairValueAssumptionsExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

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

No definition available.

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

Fair value of financial and nonfinancial obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

No definition available.