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Significant Contracts (Detail Textuals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Supply Commitment [Line Items]    
Collaboration and research and development revenue   $ 250
Daiichi Sankyo    
Supply Commitment [Line Items]    
Future milestone payments payable $ 10,000  
Period for which royalties will be paid following first commercial sale of licensed products 10 years  
Notice period for termination of license by the entity for technical, scientific, efficacy, safety, or commercial reasons 6 months  
Notice period for termination of license after launch of a sapacitabine-based product by the entity, or by either party for material default 12 months