CONDENSED CONSOLIDATED INTERIM STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Om of Medicine	Share Capital	Share Capital Om of Medicine	Additional Paid-In Capital	Deficit	Total 4Front Ventures Corp. Shareholders' Equity	Total 4Front Ventures Corp. Shareholders' Equity Om of Medicine	Non-Controlling Interest
Beginning Balance at Dec. 31, 2020	$ 42,203		$ 250,583		$ 42,116	$ (250,548)	$ 42,151		$ 52
Beginning Balance, Shares at Dec. 31, 2020	538,851,252		538,851,252
Shares issued for Pure Ratios earnout	$ 161		$ 161				161
Shares issued for Pure Ratios earnout, shares			473,491
Share-based compensation	2,396				2,396		2,396
Conversion of notes to equity	6,253		$ 6,253				6,253
Conversion of notes to equity, shares			24,366,003
Shares issued with exercise of stock options	871		$ 871				871
Shares issued with exercise of stock options, shares			1,358,116
Shares issued with exercise of warrants	1,563		$ 1,563				1,563
Shares issued with exercise of warrants, shares			2,422,363
Return of treasury shares			(8,320)
Net loss	(11,084)		$ 0		0	(11,089)	(11,089)		5
Ending Balance at Mar. 31, 2021	42,363		$ 259,431		44,512	(261,637)	42,306		57
Ending Balance, Shares at Mar. 31, 2021			567,462,905
Beginning Balance at Dec. 31, 2020	$ 42,203		$ 250,583		42,116	(250,548)	42,151		52
Beginning Balance, Shares at Dec. 31, 2020	538,851,252		538,851,252
Net loss	$ (17,302)
Ending Balance at Jun. 30, 2021	53,568		$ 273,875		47,491	(267,860)	53,506		62
Ending Balance, Shares at Jun. 30, 2021			593,898,521
Beginning Balance at Mar. 31, 2021	42,363		$ 259,431		44,512	(261,637)	42,306		57
Beginning Balance, Shares at Mar. 31, 2021			567,462,905
Shares issued for Pure Ratios earnout		$ 722		$ 722				$ 722
Shares issued for Pure Ratios earnout, shares				535,018
Share-based compensation	2,979				2,979		2,979
Conversion of notes to equity	11,466		$ 11,466				11,466
Conversion of notes to equity, shares			24,676,794
Shares issued with exercise of stock options	443		$ 443				443
Shares issued with exercise of stock options, shares			652,940
Shares issued with exercise of warrants	1,813		$ 1,813				1,813
Shares issued with exercise of warrants, shares			570,864
Net loss	(6,218)					(6,223)	(6,223)		5
Ending Balance at Jun. 30, 2021	53,568		$ 273,875		47,491	(267,860)	53,506		62
Ending Balance, Shares at Jun. 30, 2021			593,898,521
Beginning Balance at Dec. 31, 2021	$ 37,532		$ 274,120		52,197	(288,857)	37,460		72
Beginning Balance, Shares at Dec. 31, 2021	594,181,604		594,181,604
Share-based compensation	$ 1,038				1,038		1,038
Conversion of notes to equity	3,122		$ 3,122				3,122
Conversion of notes to equity, shares			6,235,512
Shares issued with exercise of warrants	50		$ 50				50
Shares issued with exercise of warrants, shares			88,659
Shares issued for Island pursuant to acquisition	18,200		$ 18,200				18,200
Shares issued for Island pursuant to acquisition, shares			28,571,428
Net loss	(5,894)					(5,899)	(5,899)		5
Ending Balance at Mar. 31, 2022	54,048		$ 295,492		53,235	(294,756)	53,971		77
Ending Balance, Shares at Mar. 31, 2022			629,077,203
Beginning Balance at Dec. 31, 2021	$ 37,532		$ 274,120		52,197	(288,857)	37,460		72
Beginning Balance, Shares at Dec. 31, 2021	594,181,604		594,181,604
Net loss	$ (12,440)
Ending Balance at Jun. 30, 2022	$ 54,902		$ 302,502		53,625	(301,307)	54,820		82
Ending Balance, Shares at Jun. 30, 2022	637,912,894		637,912,894
Beginning Balance at Mar. 31, 2022	$ 54,048		$ 295,492		53,235	(294,756)	53,971		77
Beginning Balance, Shares at Mar. 31, 2022			629,077,203
Share-based compensation	390				390		390
Shares issued with exercise of stock options	33		$ 33				33
Shares issued with exercise of stock options, shares			51,975
Shares issued for Island pursuant to acquisition	6,245		$ 6,245				6,245
Shares issued for Island pursuant to acquisition, shares			8,783,716
Warrants issued for Island pursuant to acquisition	732		$ 732				732
Net loss	(6,546)					(6,551)	(6,551)		5
Ending Balance at Jun. 30, 2022	$ 54,902		$ 302,502		$ 53,625	$ (301,307)	$ 54,820		$ 82
Ending Balance, Shares at Jun. 30, 2022	637,912,894		637,912,894