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Subsequent Event - Additional Information (Detail)
 6 Months Ended
Jul. 12, 2018
USD ($)
Parties
Jun. 30, 2018
USD ($)
$ / shares
shares
Subsequent Event [Line Items]    
Warrants exercise price | $ / shares   $ 3.52
Note And Warrant Purchase Agreement [Member]    
Subsequent Event [Line Items]    
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   31,250
Warrants exercise price | $ / shares   $ 12.00
Aldama Mining Company, S.de R.L. de C.V [Member] | Note And Warrant Purchase Agreement [Member]    
Subsequent Event [Line Items]    
Ownership interest in subsidiaries the note to be converted after sale of additional notes or date of closing   7.50%
Subsequent Event [Member] | Note And Warrant Purchase Agreement [Member]    
Subsequent Event [Line Items]    
Number of individuals purchase agreement entered into | Parties 2  
Debt instrument face amount $ 500,000  
Debt instrument interest rate 8.00%  
Maximum [Member] | Subsequent Event [Member] | Note And Warrant Purchase Agreement [Member]    
Subsequent Event [Line Items]    
Debt instrument to be issued $ 500,000  
Individual One [Member] | Minimum [Member] | Subsequent Event [Member] | Note And Warrant Purchase Agreement [Member]    
Subsequent Event [Line Items]    
Ownership percentage in company's common stock 5.00%