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Business, Liquidity and Summary of Significant Accounting Policies (Detail Textuals) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2008
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated deficit	$ (337,374,000)	$ (337,788,000)			$ (111,700,000)
Working capital	(600,000)mrna_WorkingCapitalSurplusDeficit
Cash	$ 1,163,000	$ 1,824,000	$ 5,520,000	$ 909,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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