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Accrued Liabilities (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Accrued Liabilities    
Research and development $ 319,287 $ 322,842
Payroll and related costs 240,169 539,063
Legal fees 221,473 81,550
Professional fees 123,358 35,092
Accounting fees 2,420 40,842
Other 13,615 27,309
Total accrued expenses $ 920,322 $ 1,046,698