Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Events After the Reporting Date - Additional Information (Detail) (Detail)

v3.19.1
Events After the Reporting Date - Additional Information (Detail) (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of non-adjusting events after reporting period [line items]      
Warrant exercised   6,500 1,755,141
Events After Reporting Period [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Warrant exercised 619,606    
Proceeds from warrant exercised $ 1,982,739