Share Capital - Schedule of Information About PSU, DSU, RSU and Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Number of Outstanding Stock Options
Balance, Beginning of period (in shares)	15,444,949
Granted (in shares)	5,889,310
Exercised (in shares)	(162,944)
Forfeited (in shares)	(1,998,558)
Expired (in shares)	(1,324,035)
Balance, End of period (in shares)	17,848,722
Exercisable, at end of period (in shares)	7,534,488
Vested, or expected to vest, at end of period through the life of the options (in shares)	17,394,842
Weighted Average Exercise Price /Stock Option ($)
Balance, Beginning of period (in USD per share) | $ / shares	$ 1.50
Granted (in USD per share) | $ / shares	0.80
Exercised (in USD per share) | $ / shares	0.62
Forfeited (in USD per share) | $ / shares	1.14
Expired (in USD per share) | $ / shares	3.17
Balance, End of period (in USD per share) | $ / shares	1.20
Exercisable, at end of period (in USD per share) | $ / shares	1.66
Vested, or expected to vest, at end of period through the life of the options (in USD per share) | $ / shares	$ 1.21
PSUs
Number of Outstanding Share Units
Balance, Beginning of period (in shares)	23,273,404
Granted (in shares)	13,428,840
Exercised (in shares)	(1,639,926)
Forfeited (in shares)	(4,697,122)
Expired (in shares)	0
Balance, End of period (in shares)	30,365,196
DSUs
Number of Outstanding Share Units
Balance, Beginning of period (in shares)	4,067,897
Granted (in shares)	1,642,867
Exercised (in shares)	0
Forfeited (in shares)	0
Expired (in shares)	0
Balance, End of period (in shares)	5,710,764