Fixed assets - Summary of Fixed Assets, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Fixed assets	$ 2,523	$ 2,794
Less: accumulated depreciation and amortization	2,445	1,971
Fixed assets, net	78	823
Furniture and fixtures [Member]
Property Plant And Equipment [Line Items]
Fixed assets	931	891
Computer and office equipment [Member]
Property Plant And Equipment [Line Items]
Fixed assets	1,168	1,448
Computer software [Member]
Property Plant And Equipment [Line Items]
Fixed assets	375	375
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Fixed assets	$ 49	$ 80