Leases - Right-of-use assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Operating Leased Assets [Line Items]
Less accumulated amortization	$ (1,282)	$ (802)
Right-of-use asset, net	1,736	2,077
Palo Alto, CA Office
Operating Leased Assets [Line Items]
Right-of-use asset, gross	631	630
Encino, CA Office
Operating Leased Assets [Line Items]
Right-of-use asset, gross	0	194
Hyderabad, India Office
Operating Leased Assets [Line Items]
Right-of-use asset, gross	359	365
Coquitlam, Canada Office
Operating Leased Assets [Line Items]
Right-of-use asset, gross	97	96
Westminster, Canada Office
Operating Leased Assets [Line Items]
Right-of-use asset, gross	10	10
Toronto, Canada Office
Operating Leased Assets [Line Items]
Right-of-use asset, gross	949	949
Ratingen, Germany Office
Operating Leased Assets [Line Items]
Right-of-use asset, gross	90	18
Berlin, Germany Office
Operating Leased Assets [Line Items]
Right-of-use asset, gross	536	583
Slough, United Kingdom Office
Operating Leased Assets [Line Items]
Right-of-use asset, gross	34	34
Frankfurt, Germany Office
Operating Leased Assets [Line Items]
Right-of-use asset, gross	$ 312	$ 0