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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	11. Related Party Transactions A portion of the compensation paid to David Chaplin, Ph.D., the Company’s Chief Scientific Officer and former Chief Executive Officer, was paid to Aston Biopharma Ltd. for services Dr. Chaplin performed for the Company while in the United Kingdom. The amounts paid to Aston Biopharma Ltd. aggregated $137,000 and $190,000 in 2016 and 2015, respectively. Dr. Chaplin and his wife beneficially own 33% of Angiogene Pharmaceuticals Ltd. (“Angiogene”), a company from which Mateon had previously licensed certain rights to patent applications. In 2016, the Company terminated its agreement with Angiogene and no payments were made to Angiogene. In 2015, in accordance with the terms of the agreement, the Company paid Angiogene $75,000.