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Loans Payable - Note 8 - Promissory Note - Additional Information (Detail)				3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) Cuota $ / shares	Aug. 14, 2020 USD ($) Cuota $ / shares shares	Jul. 12, 2018 USD ($) Parties	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Aug. 21, 2020 $ / shares shares	Jul. 31, 2020 $ / shares	Dec. 31, 2019 USD ($)	Jul. 08, 2019 $ / shares shares	Oct. 04, 2018 USD ($)	Aug. 17, 2018 USD ($)	Oct. 01, 2016 USD ($)
Debt Instrument [Line Items]
Debt instrument face amount															$ 3,000,000
Warrants exercise price | $ / shares									$ 4.75
Common Shares Issuable Pursuant To Exercise Of Warrants | shares									1,901,989
Gain (loss) on debt extinguishment				$ 777,484	$ 290,024	$ 777,484	$ 290,024
Fair value reacquisition price	$ 1,340,024			1,340,024		1,340,024
Debt instrument unamortized premium	$ 290,024	$ 358,497		$ 290,024		290,024
Debt modification inducement						$ 868,878	868,878
Warrants exercise price | $ \ share | $ / shares									$ 4.75
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 4.86			$ 4.86		$ 4.86				$ 3.71
Aggregate amount of indebtedness outstanding	$ 400,000			$ 400,000		$ 400,000
Debt Instrument, Convertible, Number of Equity Instruments | Cuota	82,338
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares									1,901,989
Debt Instrument, Unamortized Premium	$ 290,024	$ 358,497		290,024		290,024
Amortization of Debt Discount (Premium)				78,050		$ 217,028
Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Debt instrument face amount			$ 1,050,000
Number of individuals purchase agreement entered into | Parties			2
Debt instrument interest rate			8.00%
Debt instrument conversion rate after sale of additional notes or date of closing						8.00
Transfer of indebtedness after sale of additional notes or date of closing	$ 500,000			$ 500,000		$ 500,000
Warrants exercised to purchase common shares | shares						65,625
Warrants exercise price | $ / shares	$ 12.00	$ 4.67		$ 12.00		$ 12.00						$ 5.756
Accrued interest				$ 24,782	$ 22,877	$ 72,366	$ 66,569
Common Shares Issuable Pursuant To Exercise Of Warrants | shares		131,996										196,135
Gain (loss) on debt extinguishment		$ 777,500
Warrants exercise price | $ \ share | $ / shares	$ 12.00	$ 4.67		$ 12.00		$ 12.00						$ 5.756
Warrant expire date		Aug. 14, 2023
Debt Instrument, Maturity Date		Jul. 12, 2021
Debt Instrument, Convertible, Conversion Price | $ / shares		$ 4.67
Aggregate amount of indebtedness outstanding		$ 1,232,846
Debt Instrument, Convertible, Number of Equity Instruments | Cuota		263,993
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares		131,996										196,135
Beneficial Conversion Feature ("BCF") [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 1,050,000			$ 1,050,000		$ 1,050,000					$ 1,050,000
Minimum [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Change in the fair value of the embedded conversion option												10.00%
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Debt Instrument [Line Items]
Effects Of Modification On Cash Flow On Present Value Basis												10.00%
Maximum [Member] | Beneficial Conversion Feature ("BCF") [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Derivative asset								$ 1,050,000
Aldama Mining Company, S.de R.L. de C.V [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Ownership interest in subsidiaries the note to be converted after sale of additional notes or date of closing	7.50%			7.50%		7.50%
Debt Instrument, Redemption, Period One [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Debt instrument face amount			$ 500,000
Debt Instrument, Redemption, Period Two [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Debt instrument face amount														$ 300,000
Debt Instrument, Redemption, Period Three [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Debt instrument face amount													$ 250,000
Individual One [Member] | Minimum [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Ownership percentage in company's common stock			5.00%

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