Inventory - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Inventory Disclosure [Abstract]
Net change in inventory valuation reserves	$ (21,405)	$ 291,692	$ (83,832)	$ 383,234
Provision for excess inventory	$ 58,059	$ 288,130	$ 302,085	$ 437,893