Inventory - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Inventory Disclosure [Abstract]
Reserve for shrinkage and excess inventory			$ 62,329		$ 62,142
Net change in inventory valuation reserves	$ (1,614)	$ (66,250)	187	$ (62,427)
Provision for excess inventory	$ 12,253	$ 51,599	$ 23,533	$ 244,026