Condensed Consolidated Interim Statements of Changes in Shareholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Pure Ratios	Om of Medicine	Share Capital	Share Capital Pure Ratios	Share Capital Om of Medicine	Additional Paid-In Capital	Deficit	Total 4Front Ventures Corp. Shareholders' Equity	Total 4Front Ventures Corp. Shareholders' Equity Pure Ratios	Total 4Front Ventures Corp. Shareholders' Equity Om of Medicine	Non-Controlling Interest
Beginning Balance at Dec. 31, 2019	$ 74,760			$ 252,656			$ 25,618	$ (203,497)	$ 74,777			$ (17)
Beginning Balance, Shares at Dec. 31, 2019				531,522,819
Conversion option and warrants with notes transferred to equity	411						411		411
Shares issued for earnout		$ 94			$ 94					$ 94
Shares issued for earnout, shares					223,145
Share-based compensation	2,275						2,275		2,275
Conversion of notes to equity	2,889						2,889		2,889
Exchange of stock for convertible swap notes	(13,661)			$ (13,661)					(13,661)
Exchange of stock for convertible swap notes, shares				(29,448,468)
Net loss	(8,431)							(8,405)	(8,405)			(26)
Ending Balance at Jun. 30, 2020	58,337			$ 239,089			31,193	(211,902)	58,380			(43)
Ending Balance, Shares at Jun. 30, 2020				502,297,496
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
Shares issued for earnout		$ 161	$ 722		$ 161	$ 722				$ 161	$ 722
Shares issued for earnout, shares					473,491	535,018
Share-based compensation	5,375						5,375		5,375
Conversion of notes to equity	17,719			$ 17,719					17,719
Conversion of notes to equity, shares				49,042,797
Shares issued with exercise of stock options	$ 1,314			$ 1,314					1,314
Shares issued with exercise of stock options, shares	2,011,056			2,011,056
Shares issued with exercise of warrants	$ 3,376			$ 3,376					3,376
Shares issued with exercise of warrants, shares				2,993,227
Return of treasury shares				(8,320)
Net loss	(17,302)							(17,312)	(17,312)			10
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			593,898,521