Unaudited Condensed Consolidated Statement of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net loss	$ (65,318,000)	$ (85,741,000)
Adjustments to reconcile net loss to net cash (used in) provided by operations:
Share-based compensation	25,443,000	45,974,000
Depreciation and amortization	5,247,000	4,531,000
Transaction expenses related to the Merger	0	3,132,000
Amortization of right-of-use assets	2,327,000	2,819,000
Loss on impairment of long lived assets	536,000	446,000
Allowance for doubtful accounts	529,000	294,000
Change in fair value of warrant liabilities	2,715,000	(19,808,000)
Settlement of related party promissory notes (Note 3)	0	5,517,000
Changes in operating assets and liabilities:
Accounts receivable	(857,000)	2,042,000
Prepaid expenses and other assets	1,590,000	(4,265,000)
Accounts payable	(1,318,000)	(43,000)
Accrued expenses and other liabilities	2,011,000	402,000
Accrued compensation and benefits	(4,472,000)	(11,118,000)
Operating lease liabilities	(3,317,000)	(3,942,000)
Net cash used in operating activities	(34,884,000)	(59,760,000)
Cash flows from investing activities:
Purchases of property and equipment	(113,000)	(116,000)
Purchases of intangible assets	0	(126,000)
Capitalized internal-use software development costs	0	(4,590,000)
Purchases of certificates of deposit	(3,180,000)	0
Net cash used in investing activities	(3,293,000)	(4,832,000)
Cash flows from financing activities:
Proceeds from the Merger	0	7,865,000
Proceeds from PIPE investment and A&R FPA investors	0	208,500,000
Payments for offering costs	0	(56,852,000)
Proceeds from exercise of Public Warrants	0	22,940,000
Proceeds from exercise of options, including proceeds from repayment of promissory notes	353,000	997,000
Taxes withheld and paid related to net share settlement of equity awards	(557,000)	0
Formation of Forge Europe	0	9,488,000
Payments for redemption of Public Warrants	0	(165,000)
Net cash (used in) provided by financing activities	(204,000)	192,773,000
Effect of changes in currency exchange rates on cash and cash equivalents	(158,000)	(159,000)
Net (decrease) increase in cash and cash equivalents	(38,539,000)	128,022,000
Cash, cash equivalents and restricted cash, beginning of the period	194,965,000	76,404,000
Cash, cash equivalents and restricted cash, end of the period	156,426,000	204,426,000
Reconciliation of cash, cash equivalents and restricted cash to the amounts reported within the consolidated balance sheets
Cash and cash equivalents	155,127,000	202,603,000
Restricted cash	1,299,000	1,823,000
Total cash, cash equivalents and restricted cash, end of the period	156,426,000	204,426,000
Supplemental disclosure of non-cash investing and financing activities:
Capitalized internal-use software development costs accrued and not yet paid	0	234,000
Reclassification of deferred offering costs to equity	0	5,932,000
Conversion of preferred stock	0	246,049,000
Conversion of May 2020 and October 2020 preferred stock warrants of Legacy Forge to common stock warrants	0	2,949,000
Non-cash assets acquired in the Merger	0	193,000
Warrants issued in connection with A&R FPA	0	3,080,000
Assumption of Merger warrants liability	0	13,983,000
Vesting of early exercised stock options and restricted stock awards	225,000	1,240,000
Warrant liability reclassified to additional paid-in capital upon exercise of Public Warrants	0	698,000
Warrant liability reclassified to additional paid-in capital upon exercise of Junior Preferred Stock Warrants	0	653,000
Issuance of common stock upon settlement of related party promissory notes	0	4,207,000
Early exercise of stock options upon settlement of related party promissory notes	$ 0	$ 1,310,000