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Loans Payable - Note 8 - Promissory Note - Additional Information (Detail)		3 Months Ended		12 Months Ended
	Jul. 12, 2018 USD ($) Parties	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Oct. 31, 2018 $ / shares	Oct. 04, 2018 USD ($)	Aug. 17, 2018 USD ($)
Debt Instrument [Line Items]
Warrants exercise price | $ / shares					$ 7.155
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
Warrants exercised to purchase common shares | shares		50,000
Warrants exercise price | $ / shares		$ 12.00
Accrued interest		$ 21,510	$ 0
Beneficial Conversion Feature ("BCF") [Member]
Debt Instrument [Line Items]
Debt, interest expense		156,469	$ 0
Beneficial Conversion Feature ("BCF") [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Debt instrument face amount				$ 1,050,000
Debt, interest expense		$ 231,090
Book value of debt				231,090
Maximum [Member] | Beneficial Conversion Feature ("BCF") [Member] | Note And Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Cash proceeds from issuance of debt				$ 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%
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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