Annual report pursuant to Section 13 and 15(d)

Short-Term Notes Payable - Summary of Short Term Notes Payable (Parenthetical) (Detail)

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Short-Term Notes Payable - Summary of Short Term Notes Payable (Parenthetical) (Detail) - Short Term Note Payable [Member] - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Product Liability Insurance Financing [Member]    
Short-term Debt [Line Items]    
Debt instrument face amount $ 28,915 $ 31,985
Monthly installment including principal and interest $ 2,696 $ 3,290
Interest rate bearing 5.09% 6.18%
Maturity date Feb. 10, 2019 Jan. 10, 2018
Directors' and Officers' Liability Insurance Financing [Member]    
Short-term Debt [Line Items]    
Debt instrument face amount $ 215,575 $ 140,062
Monthly installment including principal and interest $ 20,115 $ 13,059
Interest rate bearing 5.24% 5.09%
Maturity date Jun. 24, 2019 Jun. 24, 2018