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Accrued Expenses (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Accrued Expenses [Abstract]      
Accrued licensing agreement fees $ 65,000 $ 120,000 $ 182,009
Accrued services 1,118,872 600,339 31,186
Accrued issuance costs 30,933 28,083 22,015
Accrued payroll 256,926 223,195 28,252
Advances 50,000
Other 6,947 [1] [1] 881
Total accrued expenses $ 1,478,678 $ 1,021,617 $ 264,343
[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.