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Revenue (Detail Textuals) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Revenue Recognition [Abstract]          
Revenue $ 0 $ 0 $ 0 $ 0  
Contract liability 150,000   150,000   $ 150,000
Aggregate price of transaction allocated to performance obligations $ 0   $ 0