Leases - Schedule of Right-of-use Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Less accumulated amortization	$ (1,148)	$ (986)
Operating lease right-of-use asset, net	376	531
Palo Alto, CA Office
Lessee, Lease, Description [Line Items]
Right-of-use asset, before accumulated amortization	630	630
Hyderabad, India Office
Lessee, Lease, Description [Line Items]
Right-of-use asset, before accumulated amortization	19	0
Ratingen, Germany Office
Lessee, Lease, Description [Line Items]
Right-of-use asset, before accumulated amortization	84	85
Berlin, Germany Office
Lessee, Lease, Description [Line Items]
Right-of-use asset, before accumulated amortization	500	508
Frankfurt, Germany Office
Lessee, Lease, Description [Line Items]
Right-of-use asset, before accumulated amortization	$ 291	$ 294