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Earnings (loss) Per Share - Schedule of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic earnings (loss) per share computation
Income (loss) from continuing operations attributable to common shareholders of Cronos Group		$ (72,487)	$ 1,166,869	$ (20,742)
Weighted average number of common shares outstanding (in shares)		351,576,848	310,067,179	172,269,170
Basic earnings (loss) per share (in dollars per share)		$ (0.21)	$ 3.76	$ (0.12)
Diluted earnings (loss) per share computation
Income (loss) from continuing operations used in the computation of basic earnings (loss) per share		$ (72,487)	$ 1,166,869	$ (20,742)
Adjustment for gain on revaluation of derivative liabilities		0	(24,416)	0
Income (loss) from continuing operations used in the computation of diluted income (loss) per share		$ (72,487)	$ 1,142,453	$ (20,742)
Weighted average number of common shares outstanding (in shares)		351,576,848	310,067,179	172,269,170
Weighted average number of common shares for computation of diluted income (loss) per share (in shares)	[1]	351,576,848	342,811,992	172,269,170
Diluted earnings (loss) per share (in dollars per share)	[1]	$ (0.21)	$ 3.33	$ (0.12)
Basic loss from discontinued operations per share computation
Loss from discontinued operations attributable to common shareholders of Cronos Group		$ (650)	$ (363)	$ (894)
Weighted average number of common shares outstanding (in shares)		351,576,848	310,067,179	172,269,170
Basic loss from discontinued operations per share (in dollars per share)		$ (0.00)	$ (0.00)	$ (0.01)
Altria Warrant
Diluted earnings (loss) per share computation
Dilutive effect of derivative liabilities (in shares)		0	0	0
Top-up Rights
Diluted earnings (loss) per share computation
Dilutive effect of derivative liabilities (in shares)		0	1,881,002	0
Warrants
Diluted earnings (loss) per share computation
Dilutive effect of awards (in shares)		0	19,481,352	0
Stock options
Diluted earnings (loss) per share computation
Dilutive effect of awards (in shares)		0	10,649,487	0
Restricted share units
Diluted earnings (loss) per share computation
Dilutive effect of awards (in shares)		0	732,972	0
[1] In computing diluted earnings per share, incremental common shares are not considered in periods in which a net loss is reported, as the inclusion of the common share equivalents would be anti-dilutive.

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