Inventory - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Inventory Disclosure [Abstract]
Reserve for shrinkage and excess inventory	$ 63,943		$ 62,142
Net change in inventory valuation reserves	1,801	$ 3,823
Provision for excess inventory	$ 11,280	$ 192,427