Commitments and Contingencies - Narrative (Details) $ / shares in Units, $ in Thousands				1 Months Ended	9 Months Ended
	Oct. 16, 2023 USD ($)	Apr. 20, 2023 USD ($)	Feb. 10, 2021 USD ($)	Mar. 31, 2020 lawsuit	Sep. 30, 2023 USD ($) property lease	Nov. 09, 2023 USD ($) $ / shares	Oct. 25, 2023 USD ($)	Sep. 30, 2022 USD ($)
Property Lease Guarantee
Loss Contingencies [Line Items]
Guarantor lease obligation term (in years)					11 years
Loss contingencies payments term					18 months
Operating lease right-of-use liabilities					$ 5,600			$ 5,900
Lessee guarantee, lease discount rate					4.55%
Guarantor lease obligation, maximum exposure					$ 300
Minimum
Loss Contingencies [Line Items]
Payment to construct building			$ 2,500
Minimum | Property Lease Guarantee
Loss Contingencies [Line Items]
Operating lease, rent expense					42
Maximum | Property Lease Guarantee
Loss Contingencies [Line Items]
Operating lease, rent expense					$ 63
Buildings
Loss Contingencies [Line Items]
Number of leases | lease					2
Number of properties | property					2
Buildings | Lease for 273 Fifth Avenue, Manhattan,New York
Loss Contingencies [Line Items]
Operating lease, term of contract (in years)					30 years
Buildings | Lease for 275 Fifth Avenue, Manhattan,New York
Loss Contingencies [Line Items]
Operating lease, term of contract (in years)					15 years
Putative Class Action
Loss Contingencies [Line Items]
New claims filed, number | lawsuit				2
AnHeart and Minsheng Case | Subsequent Event | Pending Litigation
Loss Contingencies [Line Items]
Amount receivable							$ 474
Delaware Action Case | Settled Litigation
Loss Contingencies [Line Items]
Proceeds from legal settlements		$ 9,250
Delaware Action Case | Subsequent Event | Settled Litigation
Loss Contingencies [Line Items]
Proceeds from legal settlements	$ 1,500
Amount receivable						$ 7,750
Amount receivable, interest rate						7.50%
Share price (in dollars per share) | $ / shares						$ 3.88