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Earnings (loss) Per Share - Schedule of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
Net income (loss) attributable to common shareholders of Cronos Group		$ (106,977)	$ 185,999	$ (30,937)	$ 500,090
Weighted average number of common shares outstanding used in the computation of basic earnings per share (in shares)		349,075,408	334,665,873	348,946,439	317,940,749
Basic earnings per share (in dollars per share)		$ (0.31)	$ 0.56	$ (0.09)	$ 1.57
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Net income (loss) used in the computation of basic earnings per share		$ (106,977)	$ 185,999	$ (30,937)	$ 500,090
Adjustment for gain (loss) on revaluation of derivative liabilities		(729)	(126,032)	(729)	(350,758)
Net income (loss) used in the computation of diluted income per share		$ (107,706)	$ 59,967	$ (31,666)	$ 149,332
Weighted average number of common shares outstanding used in the computation of basic earnings per share (in shares)		349,075,408	334,665,873	348,946,439	317,940,749
Weighted average number of common shares for computation of diluted income (loss) per share (in shares)	[1]	349,075,408	374,676,595	348,946,439	364,872,093
Diluted earnings per share (in dollars per share)		$ (0.31)	$ 0.16	$ (0.09)	$ 0.41
Altria Warrant
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Dilutive effect of derivative liabilities (in shares)		0	9,100,465	0	13,633,605
Top-up Rights
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Dilutive effect of derivative liabilities (in shares)		0	630,531	0	766,769
Warrants
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Dilutive effect of awards (in shares)		0	19,287,262	0	21,239,056
Stock options
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Dilutive effect of awards (in shares)		0	10,992,464	0	11,291,914
Restricted share units
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Dilutive effect of awards (in shares)		0	0	0	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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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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