Stockholders' Equity (Details) (USD $)	3 Months Ended
Mar. 31, 2015
Warrant Shares
Outstanding, December 31, 2014	21,212,813
Warrants issued	66,717
Outstanding, March 31, 2015	21,277,030
Expiring in 2015	285,345
Expiring in 2016	6,000,000
Expiring in 2017	7,235,622
Expiring thereafter	7,756,063
Weighted average exercise price
Number of warrants exercised	2,500mrna_ClassOfWarrantOrRightExercised
Exercised warrants	$ 0.28
Outstanding, March 31, 2015	$ 1.19
Warrants issued	$ 0.75
Outstanding, December 31, 2014	$ 1.19

Warrants issued, weighted average exercise price.

No definition available.

Name:	mrna_ClassOfWarrantOrRightExercised
Namespace Prefix:	mrna_
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Period Type:	duration

- Definition

Represents weighted average exercise price of warrant exercised.

+ References

No definition available.

+ Details

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

- Definition

Represents class of warrant or right expiring in year one.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrna_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents class of warrant or right expiring in year three.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrna_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents class of warrant or right expiring in year two.

+ References

No definition available.

+ Details

Name:	mrna_ClassOfWarrantOrRightExpiringInYearTwo
Namespace Prefix:	mrna_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents class of warrant or right expiring thereafter.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrna_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of warrants issued to vendor.

+ References

No definition available.

+ Details

Name:	mrna_ClassOfWarrantOrRightIssuedToVendor
Namespace Prefix:	mrna_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

- Definition

Represents the weighted average exercise price warrants issued to vendor.

+ References

No definition available.

+ Details

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

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

+ Details

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