Summary of Significant Accounting Policies - Schedule of Fair Value Liability of Price Adjustable Warrants Determined by Level 3 (Details)	12 Months Ended
Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Balance	$ 141,723
Reclassification of derivative liability due to adoption of ASU 2017-11	(141,723)
Balance

Reclassification of derivative liability due to adoption of ASU 2017-11.

No definition available.

Name:	MRNA_ReclassificationOfDerivativeLiabilityDueToAdoptionOfAsu201711
Namespace Prefix:	MRNA_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration