CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Island Global Holdings, Inc.	New England Cannabis Corporation	Bloom Farms	Total 4Front Ventures Corp. Shareholders' Equity	Total 4Front Ventures Corp. Shareholders' Equity Island Global Holdings, Inc.	Total 4Front Ventures Corp. Shareholders' Equity New England Cannabis Corporation	Total 4Front Ventures Corp. Shareholders' Equity Bloom Farms	Common Stock	Common Stock Island Global Holdings, Inc.	Common Stock New England Cannabis Corporation	Common Stock Bloom Farms	Additional Paid-In Capital	Deficit	Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2021									594,181,604
Beginning balance at Dec. 31, 2021	$ 37,532				$ 37,460				$ 274,120				$ 52,197	$ (288,857)	$ 72
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to acquisition (in shares)										8,783,716	28,571,428	3,750,000
Shares issued pursuant to acquisition		$ 6,245	$ 18,200	$ 2,100		$ 6,245	$ 18,200	$ 2,100		$ 6,245	$ 18,200	$ 2,100
Shares issued to settle payables (in shares)	49,234,671
Warrants issued for Island pursuant to acquisition		732				$ 732				$ 732
Share-based compensation (in shares)									1,750,604
Share-based compensation	$ 7,214				7,214								7,214
Conversion of notes to equity (in shares)									6,235,512
Conversion of notes to equity	$ 3,122				3,122				$ 3,122
Shares issued with exercise of stock options, (in shares)	133,333								51,975
Shares issued with exercise of stock options	$ 33				33				$ 33
Shares issued with exercise of warrants (in shares)									91,436
Shares issued with exercise of warrants	50				50				$ 50
Net loss	$ (46,877)	$ (10,986)	$ (2,171)		(46,898)									(46,898)	21
Ending balance (in shares) at Dec. 31, 2022	643,416,275								643,416,275
Ending balance at Dec. 31, 2022	$ 28,351				28,258				$ 304,602				59,411	(335,755)	93
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to acquisition (in shares)									2,380,952
Shares issued pursuant to acquisition	$ 447				447				$ 447
Shares issued to settle payables (in shares)	26,103,074								4,062,500
Shares issued to settle payables	$ 650				650				$ 650
Share-based compensation	5,998				5,998								5,998
Conversion of notes to equity (in shares)									10,359,372
Conversion of notes to equity	$ 2,391				2,391				$ 2,391
Shares issued with exercise of stock options, (in shares)	0
Shares issued for executive compensation (in shares)									9,300,250
Shares issued for executive compensation	$ 862				862				$ 862
Equity component of debt	1,333				1,333								1,333
Warrants issued	206				206								206
Net loss	$ (91,632)				(91,647)									(91,647)	15
Ending balance (in shares) at Dec. 31, 2023	669,519,349								669,519,349
Ending balance at Dec. 31, 2023	$ (51,394)				$ (51,502)				$ 308,952				$ 66,948	$ (427,402)	$ 108