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Accrued Expenses (Details Textual) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Accrued Expenses (Textual)      
Accrued expenses include an obligation $ 6,947 [1] [1] $ 881
Accrued services related to legal costs 1,029,069 553,037  
Accrued services related to other service costs $ 89,803 $ 47,302  
[1] Accrued expenses include an obligation to issue stock options to a consultant that has met vesting requirements as of June 30, 2018 in the amount of $6,947. See Note 10 - Stock-Based Compensation for further detail.