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Loans Payable - Note 8 - Promissory Note - Additional Information (Detail)		3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 12, 2018 USD ($) Parties	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	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
Gain (loss) on debt extinguishment				$ 290,024
Fair value reacquisition price		$ 1,340,024		1,340,024
Debt instrument unamortized premium		290,024		290,024
Amortization of debt discount premium		67,372		138,978
Debt modification inducement				$ 868,878
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
Warrants exercised to purchase common shares | shares				65,625
Warrants exercise price | $ / shares		$ 12.00		$ 12.00				$ 5.756
Accrued interest		$ 24,029	$ 22,182	$ 47,584	$ 43,691
Common Shares Issuable Pursuant To Exercise Of Warrants | shares								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
Minimum [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Change in the fair value of the embedded conversion option								10.00%
Maximum [Member] | Note And Warrant Purchase Agreement [Member]
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%
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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