Unaudited Condensed Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands		Total	Series B-1	Series B-2	Previously Reported	Revision of Prior Period, Adjustment	Common Stock		Common Stock Previously Reported		Common Stock Revision of Prior Period, Adjustment	Additional Paid-In Capital	Additional Paid-In Capital Previously Reported	Additional Paid-In Capital Revision of Prior Period, Adjustment	Accumulated Deficit	Accumulated Deficit Previously Reported	Accumulated Deficit Revision of Prior Period, Adjustment	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2020		15,717,345			33,366,839	49,084,184
Beginning balance at Dec. 31, 2020		$ 156,848				$ 156,848
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of Series B-1 and B-2 convertible preferred stock upon conversion of convertible notes and accrued interest (in shares)			27,947
Issuance of Series B-1 and B-2 Convertible preferred stock upon conversion of convertible notes and accrued interest			$ 111
Ending balance (in shares) at Mar. 31, 2021		49,112,131
Ending balance at Mar. 31, 2021		$ 156,959
Beginning balance (in shares) at Dec. 31, 2020							22,773,377		48,346,309		71,119,686
Beginning balance at Dec. 31, 2020		(7,499)				$ (7,499)		[1]		[1]		$ 52,561		$ 52,561	$ (60,060)		$ (60,060)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes (in shares)							473,658
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes		168						[1]				168
Issuance of Class AA common stock upon early exercise of unvested stock options (in shares)							1,672,270
Vesting of early exercised stock options and restricted stock awards		11										11
Share-based compensation expense		1,259										1,259
Net income (loss)		938													938
Ending balance (in shares) at Mar. 31, 2021							73,265,614
Ending balance at Mar. 31, 2021		$ (5,123)						[1]				53,999			(59,122)			$ 0	$ 0
Beginning balance (in shares) at Dec. 31, 2020		15,717,345			33,366,839	49,084,184
Beginning balance at Dec. 31, 2020		$ 156,848				$ 156,848
Ending balance (in shares) at Sep. 30, 2021		73,914,148
Ending balance at Sep. 30, 2021		$ 246,056
Beginning balance (in shares) at Dec. 31, 2020							22,773,377		48,346,309		71,119,686
Beginning balance at Dec. 31, 2020		(7,499)				$ (7,499)		[1]		[1]		52,561		52,561	(60,060)		(60,060)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(12,139)
Foreign currency translation adjustment		0
Ending balance (in shares) at Sep. 30, 2021							63,001,701
Ending balance at Sep. 30, 2021		$ (48,705)						[1]				23,494			(72,199)			0	0
Beginning balance (in shares) at Dec. 31, 2020		15,717,345			33,366,839	49,084,184
Beginning balance at Dec. 31, 2020		$ 156,848				$ 156,848
Ending balance (in shares) at Dec. 31, 2021		73,914,149	42,133,496	412,623	23,668,198	50,245,951
Ending balance at Dec. 31, 2021		$ 246,056	$ 150,553	$ 1,640	$ 246,056
Beginning balance (in shares) at Dec. 31, 2020							22,773,377		48,346,309		71,119,686
Beginning balance at Dec. 31, 2020		(7,499)				$ (7,499)		[1]		[1]		52,561		52,561	(60,060)		$ (60,060)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unissued common stock (in shares)	[2]										(210,302)
Pre-close issuance of common stock upon exercise of vested options	[1]
Pre-close issuance of common stock upon exercise of unvested options	[1]
Pre-close issuance of common stock for services	[1]
Ending balance (in shares) at Dec. 31, 2021							63,090,701		20,269,864		43,031,139
Ending balance at Dec. 31, 2021		$ (52,640)			$ (52,640)		$ 5			[1]	$ 5	25,914	$ 25,919	(5)	(78,559)	$ (78,559)
Beginning balance (in shares) at Mar. 31, 2021		49,112,131
Beginning balance at Mar. 31, 2021		$ 156,959
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of Series B-1 and B-2 convertible preferred stock upon conversion of convertible notes and accrued interest (in shares)			12,719,398	412,623
Issuance of Series B-1 and B-2 Convertible preferred stock upon conversion of convertible notes and accrued interest			$ 47,735	$ 1,640
Exchange of Class AA common stock for Series B-1 convertible preferred stock (in shares)		11,669,996
Exchange of Class AA common stock for Series B-1 convertible preferred stock		$ 39,722
Ending balance (in shares) at Jun. 30, 2021		73,914,148
Ending balance at Jun. 30, 2021		$ 246,056
Beginning balance (in shares) at Mar. 31, 2021							73,265,614
Beginning balance at Mar. 31, 2021		(5,123)						[1]				53,999			(59,122)			0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange and settlement of common stock		(39,722)						[1]				(39,722)
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes (in shares)							376,328
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes		322						[1]				322
Issuance of Class AA common stock upon early exercise of unvested stock options (in shares)							701,878
Repurchase of early exercised stock options (in shares)							(12,291)
Exchange of Class AA common stock for Series B-1 convertible preferred stock (in shares)							(11,669,996)
Vesting of early exercised stock options and restricted stock awards		45										45
Share-based compensation expense		5,892										5,892
Net income (loss)		(8,003)													(8,003)
Ending balance (in shares) at Jun. 30, 2021							62,661,533
Ending balance at Jun. 30, 2021		$ (46,589)						[1]				20,536			(67,125)			0	0
Ending balance (in shares) at Sep. 30, 2021		73,914,148
Ending balance at Sep. 30, 2021		$ 246,056
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes (in shares)							191,313
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes		87						[1]				87
Issuance of Class AA common stock upon early exercise of unvested stock options (in shares)							166,424
Repurchase of early exercised stock options (in shares)							(17,569)
Vesting of early exercised stock options and restricted stock awards		46										46
Share-based compensation expense		2,825										2,825
Net income (loss)		(5,074)													(5,074)
Foreign currency translation adjustment		0
Ending balance (in shares) at Sep. 30, 2021							63,001,701
Ending balance at Sep. 30, 2021		$ (48,705)						[1]				23,494			(72,199)			0	0
Beginning balance (in shares) at Dec. 31, 2021		73,914,149	42,133,496	412,623	23,668,198	50,245,951
Beginning balance at Dec. 31, 2021		$ 246,056	$ 150,553	$ 1,640	$ 246,056
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of preferred stock to common stock (in shares)		(73,914,149)
Conversion of preferred stock to common stock		$ (246,056)
Ending balance (in shares) at Mar. 31, 2022		0
Ending balance at Mar. 31, 2022		$ 0
Beginning balance (in shares) at Dec. 31, 2021							63,090,701		20,269,864		43,031,139
Beginning balance at Dec. 31, 2021		(52,640)			$ (52,640)		$ 5			[1]	$ 5	25,914	25,919	(5)	(78,559)	(78,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pre-close exercise of vested options (in shares)							190,505
Pre-close issuance of common stock upon exercise of vested options		102										102
Pre-close exercise of unvested options (in shares)							4,472
Pre-close issuance common stock for services (in shares)							62,952
Pre-close issuance of common stock for services		621										600
Conversion of preferred stock to common stock (in shares)							73,914,149
Conversion of preferred stock to common stock		246,056					$ 7					246,049
Conversion of May 2020 and October 2020 preferred stock warrants of Legacy Forge to common stock warrants		2,949										2,949
Exchange and settlement of common stock		4,207					$ 2					4,205
Issuance of common stock upon Merger (net of redemptions), including PIPE and A&R FPA investors, net of transaction costs (in shares)							31,961,047
Issuance of common stock upon Merger (net of redemptions), including PIPE and A&R FPA investors, net of transaction costs		140,811					$ 3					140,808
Vesting of early exercised stock options and restricted stock awards		409										409
Share-based compensation expense		7,948										7,948
Net income (loss)		(64,424)													(64,424)
Ending balance (in shares) at Mar. 31, 2022							169,223,826
Ending balance at Mar. 31, 2022		$ 286,039					$ 17					429,005			(142,983)			0	0
Beginning balance (in shares) at Dec. 31, 2021		73,914,149	42,133,496	412,623	23,668,198	50,245,951
Beginning balance at Dec. 31, 2021		$ 246,056	$ 150,553	$ 1,640	$ 246,056
Ending balance (in shares) at Sep. 30, 2022		0
Ending balance at Sep. 30, 2022		$ 0
Beginning balance (in shares) at Dec. 31, 2021							63,090,701		20,269,864		43,031,139
Beginning balance at Dec. 31, 2021		$ (52,640)			$ (52,640)		$ 5			[1]	$ 5	25,914	$ 25,919	$ (5)	(78,559)	$ (78,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes (in shares)		1,042,214
Issuance of common stock upon exercise of public warrants (in shares)		1,994,790
Net income (loss)		$ (85,741)
Foreign currency translation adjustment		(159)
Ending balance (in shares) at Sep. 30, 2022							172,442,676
Ending balance at Sep. 30, 2022		$ 337,809					$ 18					496,592			(164,300)			(95)	5,594
Beginning balance (in shares) at Mar. 31, 2022		0
Beginning balance at Mar. 31, 2022		$ 0
Ending balance (in shares) at Jun. 30, 2022		0
Ending balance at Jun. 30, 2022		$ 0
Beginning balance (in shares) at Mar. 31, 2022							169,223,826
Beginning balance at Mar. 31, 2022		286,039					$ 17					429,005			(142,983)			0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pre-close exercise of vested options (in shares)							146,232
Pre-close issuance of common stock upon exercise of vested options		401						[1]				401
Stock Issued During Period, Shares, Acquisitions	[2]						210,302
Issuance of common stock upon exercise of public warrants (in shares)							1,994,022
Issuance of common stock upon exercise of Public Warrants		23,629						[1]				23,629
Vesting of early exercised stock options and restricted stock awards		638										638
Share-based compensation expense		10,903										10,903
Net income (loss)		(5,119)													(5,119)
Ending balance (in shares) at Jun. 30, 2022							171,364,080
Ending balance at Jun. 30, 2022		$ 316,491					$ 17					464,576			(148,102)			0	0
Ending balance (in shares) at Sep. 30, 2022		0
Ending balance at Sep. 30, 2022		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pre-close exercise of vested options (in shares)							622,929
Pre-close issuance of common stock upon exercise of vested options		365						[1]				364
Pre-close exercise of unvested options (in shares)							78,076
Issuance of common stock upon exercise of Junior Preferred Stock Warrants (in shares)							123,379
Issuance of common stock upon exercise of Junior Preferred Stock Warrants		653						[1]				653
Issuance of common stock upon Merger	[1]
Formation of Forge Europe		9,488										3,830							5,658
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes		$ 193										193
Issuance of common stock upon exercise of public warrants (in shares)		768					768
Issuance of common stock upon exercise of Public Warrants		$ 9						[1]				9
Issuance of common stock upon release of restricted stock units (in shares)		43,142
Issuance of common stock upon release of restricted stock units	[1]
Share-based compensation expense		$ 26,967										26,967
Net income (loss)		(16,198)													(16,198)					[1]
Foreign currency translation adjustment		(159)																(95)	(64)
Ending balance (in shares) at Sep. 30, 2022							172,442,676
Ending balance at Sep. 30, 2022		$ 337,809					$ 18					$ 496,592			$ (164,300)			$ (95)	$ 5,594

[1] amount less than 1

[2] This amount represents shares that were not issued upon the closing of the Merger (see Note 3) as a result of a shareholder’s demand for appraisal rights. These shares were issued to the shareholder during the three months ended September 30, 2022 after the statutory period to perfect such rights lapsed.