Accrued Liabilities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Accrued Liabilities
Accrued payroll costs	$ 1,110,681	$ 1,218,904
Other accrued liabilities	1,321,226	548,515
Accrued Liabilities, Current	$ 2,431,907	$ 1,767,419