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Organization and Description of Business (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 113 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Organization and Description of Business [Line Items]              
Net Loss $ (2,236,000) $ (2,431,000) $ (4,615,000) $ (5,020,000) $ 44,946,000    
Cash and Cash Equivalents, at Carrying Value, Total $ 5,460,000 $ 5,373,000 $ 5,460,000 $ 5,373,000 $ 5,460,000 $ 1,259,000 $ 10,985,000