CONDENSED CONSOLIDATED INTERIM STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Share Capital	Additional Paid-In Capital	Deficit	Total 4Front Ventures Corp. Shareholders' Equity	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)			(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, 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 NECC pursuant to acquisition	17,689	$ 17,689	0	0	17,689	0
Shares issued for NECC pursuant to acquisition, shares		28,571,428
Net loss	(5,894)			(5,899)	(5,899)	5
Ending Balance at Mar. 31, 2022	$ 53,537	$ 294,981	$ 53,235	$ (294,756)	$ 53,460	$ 77
Ending Balance, Shares at Mar. 31, 2022	629,077,203	629,077,203