CONDENSED CONSOLIDATED INTERIM STATEMENTS OF CHANGES IN SHAREHOLDERS' DEFICIT (unaudited) - USD ($) $ in Thousands	Total	Total 4Front Ventures Corp. Shareholders' Equity	Common Stock	Additional Paid-In Capital	Deficit	Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2022			643,416,275
Beginning balance at Dec. 31, 2022	$ 28,351	$ 28,258	$ 304,602	$ 59,411	$ (335,755)	$ 93
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,020	1,020		1,020
Net loss	(11,392)	(11,397)			(11,397)	5
Ending balance (in shares) at Mar. 31, 2023			643,416,275
Ending balance at Mar. 31, 2023	17,979	17,881	$ 304,602	60,431	(347,152)	98
Beginning balance (in shares) at Dec. 31, 2022			643,416,275
Beginning balance at Dec. 31, 2022	28,351	28,258	$ 304,602	59,411	(335,755)	93
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(22,856)
Ending balance (in shares) at Jun. 30, 2023			649,859,727
Ending balance at Jun. 30, 2023	7,826	7,723	$ 305,699	60,645	(358,621)	103
Beginning balance (in shares) at Mar. 31, 2023			643,416,275
Beginning balance at Mar. 31, 2023	17,979	17,881	$ 304,602	60,431	(347,152)	98
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation		214		214
Shares issued for asset acquisition (in shares)			2,380,952
Shares issued for asset acquisition	447	447	$ 447
Shares issued to settle payables (in shares)			4,062,500
Shares issued to settle payables	650	650	$ 650
Net loss	(11,464)	(11,469)			(11,469)	5
Ending balance (in shares) at Jun. 30, 2023			649,859,727
Ending balance at Jun. 30, 2023	$ 7,826	7,723	$ 305,699	60,645	(358,621)	103
Beginning balance (in shares) at Dec. 31, 2023	669,519,349		669,519,349
Beginning balance at Dec. 31, 2023	$ (51,394)	(51,502)	$ 308,952	66,948	(427,402)	108
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of debt to equity (in shares)			244,680,852
Conversion of debt to equity	28,270	28,270	$ 28,270	0
Share-based compensation	1,008	1,008		1,008
Net loss	(18,453)	(18,453)			(18,453)
Ending balance (in shares) at Mar. 31, 2024			914,200,201
Ending balance at Mar. 31, 2024	$ (40,569)	(40,677)	$ 337,222	67,956	(445,855)	108
Beginning balance (in shares) at Dec. 31, 2023	669,519,349		669,519,349
Beginning balance at Dec. 31, 2023	$ (51,394)	(51,502)	$ 308,952	66,948	(427,402)	108
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued to settle payables (in shares)	245,680,852
Net loss	$ (23,320)
Ending balance (in shares) at Jun. 30, 2024	915,200,201		915,200,201
Ending balance at Jun. 30, 2024	$ (44,538)	(44,646)	$ 337,222	68,854	(450,722)	108
Beginning balance (in shares) at Mar. 31, 2024			914,200,201
Beginning balance at Mar. 31, 2024	(40,569)	(40,677)	$ 337,222	67,956	(445,855)	108
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	786	786		786
Shares issued for executive compensation (in shares)			1,000,000
Shares issued for executive compensation	112	112		112
Net loss	$ (4,867)	(4,867)			(4,867)
Ending balance (in shares) at Jun. 30, 2024	915,200,201		915,200,201
Ending balance at Jun. 30, 2024	$ (44,538)	$ (44,646)	$ 337,222	$ 68,854	$ (450,722)	$ 108