Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands		Total	Series B-1	Series B-2	Junior	Previously Reported	Retroactive application of recapitalization	Common Stock	Common Stock Previously Reported	Common Stock Retroactive application of recapitalization	Additional Paid-In Capital	Additional Paid-In Capital Previously Reported	Additional Paid-In Capital Retroactive application of recapitalization	Accumulated Deficit	Accumulated Deficit Previously Reported	Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Previously Reported	Noncontrolling Interest	Noncontrolling Interest Previously Reported
Beginning balance (in shares) at Dec. 31, 2019		27,160,848				8,697,229	18,463,619
Beginning balance at Dec. 31, 2019		$ 84,998				$ 84,998
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of convertible preferred stock (in shares)			11,126,594		7,225,285
Issuance of convertible preferred stock			$ 41,527		$ 20,383
Issuance of convertible preferred stock upon conversion of convertible notes and accrued interest (in shares)			3,571,458
Issuance of convertible preferred stock upon conversion of convertible notes and accrued interest			$ 9,940
Ending balance (in shares) at Dec. 31, 2020		49,084,185
Ending balance at Dec. 31, 2020		$ 156,848
Beginning balance (in shares) at Dec. 31, 2019								42,582,417	13,635,614	28,946,803
Beginning balance at Dec. 31, 2019		(47,563)				$ (47,563)		$ 4		$ 4	$ 2,781	$ 2,785	$ (4)	$ (50,348)	$ (50,348)	$ 0	$ 0	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange and settlement of common stock (in shares)								28,153,660
Exchange and settlement of common stock		44,817									44,817
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes (in shares)								64,020
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes		21									21
Issuance of Class AA common stock upon early exercise of unvested stock options (in shares)								897,149
Repurchase of early exercised stock options (in shares)								(578,226)
Conversion of convertible notes into Series B-1 convertible preferred stock		32									32
Share-based compensation expense		4,906									4,906
Net loss		(9,712)												(9,712)
Foreign currency translation adjustment		0
Ending balance (in shares) at Dec. 31, 2020								71,119,020
Ending balance at Dec. 31, 2020		$ (7,499)						$ 4			52,557			(60,060)		0		0
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of convertible preferred stock (in shares)			12,719,398	412,623
Issuance of convertible preferred stock			$ 47,735	$ 1,640
Issuance of convertible preferred stock upon conversion of convertible notes and accrued interest (in shares)			27,947
Issuance of convertible preferred stock upon conversion of convertible notes and accrued interest			$ 111
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 Dec. 31, 2021		73,914,149	42,133,496	412,623	7,225,285	73,914,149
Ending balance at Dec. 31, 2021		$ 246,056	$ 150,553	$ 1,640	$ 20,383	$ 246,056
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unissued common stock (in shares)	[1]									(210,302)
Exchange and settlement of common stock (in shares)								(11,669,996)
Exchange and settlement of common stock		(39,722)									(39,722)
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes (in shares)								1,290,307
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes		704									704
Issuance of Class AA common stock upon early exercise of unvested stock options (in shares)								2,604,724
Repurchase of early exercised stock options (in shares)								(43,052)
Conversion of convertible notes into Series B-1 convertible preferred stock		145									145
Share-based compensation expense		12,231									12,231
Net loss		(18,499)												(18,499)
Foreign currency translation adjustment		0
Ending balance (in shares) at Dec. 31, 2021								63,090,701	63,301,003
Ending balance at Dec. 31, 2021		$ (52,640)				$ (52,640)		$ 4	$ 4		25,915	$ 25,915		(78,559)	$ (78,559)	0	$ 0	0	$ 0
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 Dec. 31, 2022		0
Ending balance at Dec. 31, 2022		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pre-close issuance of common stock upon exercise of vested options (in shares)								190,505
Pre-close issuance of common stock upon exercise of vested options		102									102
Pre-close issuance of common stock upon 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									621
Conversion of preferred stock to common stock (in shares)		210,302						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)	[1]							32,171,349
Issuance of common stock upon Merger (net of redemptions), including PIPE and A&R FPA investors, net of transaction costs	[1]	$ 140,811						$ 3			140,808
Issuance of common stock upon exercise of Public Warrants (in shares)		1,994,790						1,994,790
Issuance of common stock upon exercise of Public Warrants		$ 23,638									23,638
Issuance of common stock upon release of restricted stock units (in shares)								139,340
Issuance of common stock upon exercise of vested options (in shares)								954,257
Issuance of common stock upon exercise of vested options		855									854
Issuance of common stock upon early 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									653
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 (in shares)		1,227,310
Issuance of Class AA common stock upon exercise of vested stock options, including stock options exercised via promissory notes		$ 1,554									1,554
Repurchase of early exercised stock options (in shares)								(163,054)
Share-based compensation expense		57,917									57,917
Net loss		(111,905)												(111,859)				(46)
Foreign currency translation adjustment		1,155														693		462
Ending balance (in shares) at Dec. 31, 2022								172,560,916
Ending balance at Dec. 31, 2022		$ 325,461						$ 18			$ 509,094			$ (190,418)		$ 693		$ 6,074

[1] This amount represents shares that were not issued upon the closing of the Business Combination (see Note 3) as a result of a shareholder’s demand for appraisal rights. These shares were issued to the shareholder during the year ended December 31, 2022 after the statutory period to perfect such rights lapsed.