Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Accounts payable and accrued liabilities - Additional Information (Detail)

v3.19.3
Accounts payable and accrued liabilities - Additional Information (Detail) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Accrued Expenses And Other Liabilities [Line Items]    
Accounts payable and accrued liabilities $ 12,231,777 $ 6,447,888
Research And Development Suppliers [member]    
Accrued Expenses And Other Liabilities [Line Items]    
Accounts payable and accrued liabilities 10,949,280  
Legal And Insurance Service Provider [member]    
Accrued Expenses And Other Liabilities [Line Items]    
Accounts payable and accrued liabilities $ 675,289