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

Accounts payable and accrued liabilities - Additional Information (Detail)

v3.20.2
Accounts payable and accrued liabilities - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 08, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Accrued Expenses And Other Liabilities [Line Items]            
Accounts payable and accrued liabilities   $ 8,376,796   $ 8,376,796   $ 11,412,896
Gain on settlement   1,839,626 1,839,626  
Naglreiter Consulting, LLC [Member]            
Accrued Expenses And Other Liabilities [Line Items]            
Gain on settlement       1,839,626    
Payment under litigtion settlement $ 1,050,000          
Research And Development Suppliers [Member]            
Accrued Expenses And Other Liabilities [Line Items]            
Accounts payable and accrued liabilities   6,185,381   6,185,381    
Legal And Insurance Service Provider [Member]            
Accrued Expenses And Other Liabilities [Line Items]            
Accounts payable and accrued liabilities   $ 1,572,920   $ 1,572,920