Fair Value Measurements - Hierarchy for Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	$ 2	$ 1,153
Payment-dependent notes receivable, noncurrent	6,508	13,453
Payment-dependent notes payable, current	2	1,153
Payment-dependent notes payable, non-current	6,508	13,453
Warrant liabilities	632	7,844
Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	2	1,153
Payment-dependent notes receivable, noncurrent	6,508	13,453
Total financial assets	155,489	38,846
Payment-dependent notes payable, current	2	1,153
Payment-dependent notes payable, non-current	6,508	13,453
Warrant liabilities		7,844
Total financial liabilities	7,142	22,450
Fair Value, Recurring | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	410
Fair Value, Recurring | Private Placement Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	222
Fair Value, Recurring | Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents:	148,979	24,240
Fair Value, Recurring | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	2	1,153
Payment-dependent notes receivable, noncurrent	0	0
Total financial assets	148,981	25,393
Payment-dependent notes payable, current	2	1,153
Payment-dependent notes payable, non-current	0	0
Warrant liabilities		0
Total financial liabilities	2	1,153
Fair Value, Recurring | Level 1 | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0
Fair Value, Recurring | Level 1 | Private Placement Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0
Fair Value, Recurring | Level 1 | Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents:	148,979	24,240
Fair Value, Recurring | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	0	0
Payment-dependent notes receivable, noncurrent	0	0
Total financial assets	0	0
Payment-dependent notes payable, current	0	0
Payment-dependent notes payable, non-current	0	0
Warrant liabilities		0
Total financial liabilities	0	0
Fair Value, Recurring | Level 2 | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0
Fair Value, Recurring | Level 2 | Private Placement Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0
Fair Value, Recurring | Level 2 | Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents:	0	0
Fair Value, Recurring | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	0	0
Payment-dependent notes receivable, noncurrent	6,508	13,453
Total financial assets	6,508	13,453
Payment-dependent notes payable, current	0	0
Payment-dependent notes payable, non-current	6,508	13,453
Warrant liabilities		7,844
Total financial liabilities	7,140	21,297
Fair Value, Recurring | Level 3 | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	410
Fair Value, Recurring | Level 3 | Private Placement Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	222
Fair Value, Recurring | Level 3 | Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents:	$ 0	$ 0