Fair Value Measurements - Hierarchy for Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, noncurrent	$ 5,830	$ 7,371
Payment-dependent notes payable, noncurrent	5,830	7,371
Warrant liabilities	4,228	606
Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	2	5
Payment-dependent notes receivable, noncurrent	5,830	7,371
Certificates of deposit	2,665
Total financial assets	109,939	156,515
Payment-dependent notes payable, current	2	5
Payment-dependent notes payable, noncurrent	5,830	7,371
Total financial liabilities	10,060	7,982
Certificates of deposit required for real estate lease agreement	400
Fair Value, Recurring | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	1,468	384
Fair Value, Recurring | Private placement warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	2,760	222
Fair Value, Recurring | Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents	101,442	149,139
Fair Value, Recurring | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	2	5
Payment-dependent notes receivable, noncurrent	0	0
Certificates of deposit	0
Total financial assets	101,444	149,144
Payment-dependent notes payable, current	2	5
Payment-dependent notes payable, noncurrent	0	0
Total financial liabilities	2	5
Fair Value, Recurring | Level 1 | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0	0
Fair Value, Recurring | Level 1 | Private placement warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0	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	101,442	149,139
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
Certificates of deposit	2,665
Total financial assets	2,665	0
Payment-dependent notes payable, current	0	0
Payment-dependent notes payable, noncurrent	0	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	0
Fair Value, Recurring | Level 2 | Private placement warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0	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	5,830	7,371
Certificates of deposit	0
Total financial assets	5,830	7,371
Payment-dependent notes payable, current	0	0
Payment-dependent notes payable, noncurrent	5,830	7,371
Total financial liabilities	10,058	7,977
Fair Value, Recurring | Level 3 | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	1,468	384
Fair Value, Recurring | Level 3 | Private placement warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	2,760	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