Share Capital - Additional Information (Details)
 1 Months Ended 9 Months Ended 12 Months Ended
Aug. 27, 2018
USD ($)
shares
Aug. 31, 2019
USD ($)
shares
Oct. 31, 2018
USD ($)
shares
Sep. 30, 2021
USD ($)
Vote
$ / shares
shares
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
Dispensary
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Class Of Stock [Line Items]                
Common stock, shares issued       129,531,207   119,573,998 110,346,346  
Common stock, shares outstanding       129,531,207   119,573,998 110,346,346  
Common stock, shares authorized, unlimited       Unlimited   Unlimited Unlimited  
Promissory notes | $       $ 6,000,000   $ 6,000,000   $ 6,000,000.0
Stock issued during the period, conversion of debt | $               200,000
debt discount | $               $ 50,000
Common stock, value, subscriptions | $ $ 50,600,000              
Proceeds from issuance of common stock | $ $ 47,500,000              
Percentage of cash fee paid on gross proceeds of warrants issued 6.00%              
Percentage of cash fee payable on gross proceeds of warrants issued 3.00%              
Warrants outstanding 535,446              
Number of warrants exercised   214,178 321,268         8,784,872
Proceeds from warrant exercised | $   $ 964,000,000 $ 1,500,000 $ 7,672,000 $ 11,459,000 $ 11,459,000 $ 964,000 $ 1,289,000
Subordinate Voting Shares                
Class Of Stock [Line Items]                
Voting rights       At each such meeting holders of Subordinate Voting Shares shall be entitled to one vote in respect of each Subordinate Voting Share held.   At each such meeting holders of Subordinate Voting Shares shall be entitled to one vote in respect of each Subordinate Voting Share held.    
Number of votes entitled by each share of common stockholder       1   1    
Dividend declared | $ / shares       $ 0        
Dividend paid | $ / shares       $ 0        
Common stock, shares issued       74,611,611 58,134,478 59,952,461 35,871,672 11,135,117
Common stock, shares outstanding       74,611,611 58,134,478 59,952,461 35,871,672 11,135,117
Common stock, shares authorized, unlimited       Unlimited Unlimited Unlimited    
Conversion of stock, shares issued 3,573,450           7,089,077  
Common stock, shares converted 10,927,500     54,919,596 1,476,959   17,433,300  
Multiple Voting Shares                
Class Of Stock [Line Items]                
Voting rights       At each such meeting, holders of Multiple Voting Shares are entitled to one vote in respect of each Subordinate Voting Share into which such Multiple Voting Share could ultimately then be converted (initially, 100 votes per Multiple Voting Share). The initial “Conversation Ratio” for Multiple Voting Shares is 100 Subordinate Voting shares for each Multiple Voting Share,   At each such meeting, holders of Multiple Voting Shares are entitled to one vote in respect of each Subordinate Voting Share into which such Multiple Voting Share could ultimately then be converted (initially, 100 votes per Multiple Voting Share)    
Number of votes entitled by each share of common stockholder       1   1    
Dividend declared | $ / shares       $ 0        
Dividend paid | $ / shares       $ 0        
Common stock, shares issued       549,196 14,770 14,390 66,614 137,505
Common stock, shares outstanding       549,196 14,770 14,390 66,614 137,505
Common stock, shares authorized, unlimited       Unlimited Unlimited Unlimited    
Common stock, conversion basis       100 Subordinate Voting shares for each Multiple Voting Share   100 Subordinate Voting shares for each Multiple Voting Share    
Common stock, conversion ratio       100   100    
Conversion of stock, shares issued             70,891  
Common stock, shares converted 35,734.50         1,439,037 6,661,374 13,750,451
Super Voting Shares                
Class Of Stock [Line Items]                
Voting rights       At each such meeting, holders of Super Voting Shares are be entitled to two votes in respect of each Subordinate Voting Share into which such Super Voting Share could ultimately then be converted (initially, 200 votes per Super Voting Share).   At each such meeting, holders of Super Voting Shares are be entitled to two votes in respect of each Subordinate Voting Share into which such Super Voting Share could ultimately then be converted (initially, 200 votes per Super Voting Share).    
Number of votes entitled by each share of common stockholder       2   2    
Common stock, shares issued       0 581,825 581,825 678,133 852,466
Common stock, shares outstanding       0 581,825 581,825 678,133 852,466
Common stock, shares authorized, unlimited       Unlimited Unlimited      
Common stock, conversion basis       one Multiple Voting Share for each Super Voting Share   one Multiple Voting Share for each Super Voting Share    
Common stock, conversion ratio       200   200    
Conversion of stock, shares issued             174,333  
Common stock, shares converted       58,182,500 58,182,500 58,182,500 67,813,300 85,246,600
Subscription Receipts [Member]                
Class Of Stock [Line Items]                
Common stock, shares issued 10,927,500              
Common stock, shares outstanding 10,927,500              
Common stock, shares subscribed but unissued 10,927,500