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Derivative Liabilities - Narrative (Details) $ in Thousands		10 Months Ended	12 Months Ended
	Mar. 08, 2019 warrant $ / shares shares	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) shares
Derivative [Line Items]
Gain on revaluation		$ 1,276,819	$ 129,254
Altria Group, Inc. | Cronos Group, Inc.
Derivative [Line Items]
Ownership interest	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			80,100,000
Altria Warrant
Derivative [Line Items]
Number of warrants issued | warrant	1
Exercise price (in dollars per share) | $ / shares	$ 19.00
Gain on revaluation		869,630	$ 95,045
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		81,070	885
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	10 days
Derivative transaction costs		22,355
Gain on revaluation		$ 326,119	$ 33,324

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