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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
Dec. 31, 2013
Jun. 30, 2008
Business, Going Concern And Summary Of Significant Accounting Policies [Line Items]          
Accumulated deficit   $ 334,451 $ 337,788    
Working capital deficit   (1,600)      
Cash   $ 710 1,824 $ 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%