Share Capital - Schedule of PSU, DSU, RSU and Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of Outstanding Stock Options
Beginning Balance (in shares)	15,444,949
Granted (in shares)	5,834,014
Exercised (in shares)	(56,898)
Forfeited (in shares)	(1,628,591)
Expired (in shares)	(1,279,641)
Ending Balance (in shares)	18,313,833
Weighted Average Exercise Price/Stock Option ($)
Beginning balance (in dollars per share) | $ / shares	$ 1.50
Granted (in dollars per share) | $ / shares	0.80
Exercised (in dollars per share) | $ / shares	0.33
Forfeited (in dollars per share) | $ / shares	0.90
Expired (in dollars per share) | $ / shares	3.17
Ending balance (in dollars per share) | $ / shares	$ 1.22
PSUs
Number of Outstanding Share Units
Beginning Balance (in shares)	23,273,404
Granted (in shares)	13,428,840
Exercised (in shares)	(2,733,209)
Forfeited (in shares)	(3,492,165)
Expired (in shares)	0
Ending Balance (in shares)	30,476,870
DSUs
Number of Outstanding Share Units
Beginning Balance (in shares)	4,067,897
Granted (in shares)	1,310,122
Exercised (in shares)	0
Forfeited (in shares)	0
Expired (in shares)	0
Ending Balance (in shares)	5,378,019