Short-Term Notes Payable - Additional Information (Detail) - USD ($)	Jul. 24, 2018	Mar. 10, 2018	Jul. 24, 2017	Mar. 10, 2017	Sep. 30, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Short term notes payable for financing insurance policies					$ 190,407	$ 80,478
Product Liability Insurance Financing [Member] | Short Term Note Payable [Member]
Short-term Debt [Line Items]
Debt instrument face amount		$ 28,915		$ 31,985
Interest rate on short-term note		5.09%		6.18%
Principal and interest first required payment date		Apr. 10, 2018		Apr. 10, 2017
Short-term notes payable amortization period		11 months		10 months
Final payment date of short-term note payable		Feb. 10, 2019		Jan. 02, 2018
Directors' and Officers' Liability Insurance Financing [Member] | Short Term Note Payable [Member]
Short-term Debt [Line Items]
Debt instrument face amount	$ 215,575		$ 140,062
Interest rate on short-term note	5.24%		5.09%
Principal and interest first required payment date	Aug. 24, 2018		Aug. 24, 2017
Short-term notes payable amortization period	11 months		11 months
Final payment date of short-term note payable	Jun. 25, 2019		Jun. 25, 2018