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Business, Liquidity and Summary of Significant Accounting Policies (Detail Textuals 1) - USD ($)
$ in Thousands
12 Months Ended
Mar. 10, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2013
Jun. 30, 2008
Business, Going Concern And Summary Of Significant Accounting Policies [Line Items]              
Accumulated deficit   $ 334,451 $ 337,788 $ 333,384     $ (107,700)
Working capital deficit   (1,600)   (2,400)      
Cash   $ 710 1,824 $ 307 $ 1,163 $ 909  
RNA therapeutics              
Business, Going Concern And Summary Of Significant Accounting Policies [Line Items]              
Accumulated deficit             $ 108,800
Licensing revenue | MiNA              
Business, Going Concern And Summary Of Significant Accounting Policies [Line Items]              
Licenses Revenue     $ 500        
Concentration Risk, Percentage   29.00%          
Licensing revenue | Mirna              
Business, Going Concern And Summary Of Significant Accounting Policies [Line Items]              
Licenses Revenue   $ 700          
Concentration Risk, Percentage   71.00%          
Subsequent event | Microlin Bio, Inc. ("Microlin")              
Business, Going Concern And Summary Of Significant Accounting Policies [Line Items]              
Ownership percentage of issued and outstanding shares 25.00%