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Derivative Liabilities - Narrative (Details) $ in Thousands		3 Months Ended	6 Months Ended
	Mar. 08, 2019 day warrant $ / shares shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($) shares
Derivative [Line Items]
Gain on revaluation		$ (35,880)	$ 77,488
Altria Group, Inc. | Cronos Group, Inc.
Derivative [Line Items]
Ownership percentage	45.00%
Altria Investment
Derivative [Line Items]
Shares issued (in shares) | shares	149,831,154
Cronos Group, Inc. | Altria Group, Inc.
Derivative [Line Items]
Ownership percentage, if warrant exercised	55.00%
Altria Investment
Derivative [Line Items]
Maximum additional subscription percentage	10.00%
Derivative liability, additional subscription (in shares) | shares		77,800,000	77,800,000
Altria Warrant
Derivative [Line Items]
Exercise price (in dollars per share) | $ / shares	$ 19.00
Gain on revaluation		$ (30,052)	$ 58,052
Pre-emptive Rights
Derivative [Line Items]
Exercise price (in dollars per share) | $ / shares	$ 16.25
Exercise rights, minimum ownership percentage	20.00%
Gain on revaluation		(2,610)	(3,925)
Top-up Rights
Derivative [Line Items]
Exercise price (in dollars per share) | $ / shares	$ 16.25
Exercise rights, minimum ownership percentage	20.00%
Exercise price, volume-weighted average price, measurement period	10 days
Exercise price, volume-weighted average price, measurement period, days preceding exercise | day	10
Derivative transaction costs			22,355
Gain on revaluation		$ (3,218)	$ 23,361
Altria Warrant | Cronos Group, Inc.
Derivative [Line Items]
Number of warrants issued | warrant	1

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