Property and Equipment (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Property, equipment and depreciation and amortization
Property and equipment, gross	$ 1,559,768	$ 3,414,494
Less—accumulated depreciation and amortization	(1,307,715)	(2,110,061)
Property and equipment, net	252,053	1,304,433
Furniture and office equipment
Property, equipment and depreciation and amortization
Property and equipment, gross	775,030	775,030
Leasehold improvements
Property, equipment and depreciation and amortization
Property and equipment, gross	102,230	1,962,230
Laboratory equipment
Property, equipment and depreciation and amortization
Property and equipment, gross	$ 682,508	$ 677,234