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Share-based Payments - Summary of the Changes in Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted average exercise price (C$)
Balance at beginning of period (in dollars per share)	$ 4.84	$ 2.99
Issuance of options (in dollars per share)	6.96	20.08
Exercised (in dollars per share)	2.03	3.48
Cancellation, forfeiture and expiry of options (in dollars per share)	14.34	2.27
Balance at end of period (in dollars per share)	5.40	4.84	$ 2.99
Exercisable (in dollars per share)	$ 3.75	$ 2.93
Number of options
Balance at beginning of period (in shares)	14,149,502	12,902,995
Issuance of options (in shares)	2,000,000	1,534,162
Exercised (in shares)	(2,131,939)	(282,572)
Cancellation of options (in shares)	(262,415)	(5,083)
Balance at end of period (in shares)	13,755,148	14,149,502	12,902,995
Exercisable (in shares)	9,643,682	9,034,714
Weighted average remaining contractual term (years)
Outstanding	2 years 3 months 18 days	2 years 6 months 21 days	3 years 4 months 6 days
Exercisable	1 year 4 months 2 days	2 years 3 months 7 days

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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