Accounts Payable And Accrued Expenses (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Accounts Payable And Accrued Expenses [Abstract]
Trade payables	$ 927,020	$ 547,519
Accrued expenses	202,068	140,637
Accrued research and development contract costs	923,809	1,782,131
Payroll liabilities	193,303	682,263
Total accounts payable and accrued expenses	$ 2,246,200	$ 3,152,550