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Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]      
Furniture and equipment $ 559,203 $ 282,896 $ 189,401
Leasehold improvements 1,249,628 626,368 472,218
Property and equipment, gross 1,808,831 909,264 661,619
Less: accumulated depreciation and amortization (414,891) (271,977) (144,617)
Property and equipment, net $ 1,393,940 $ 637,287 $ 517,002