Leases - Schedule of right-of-use assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Less accumulated amortization	$ (1,135)
Right-of-use asset, net	1,587	$ 2,077
Palo Alto, CA Office
Right-of-use asset, before accumulated amortization	631
Hyderabad, India Office
Right-of-use asset, before accumulated amortization	360
Coquitlam, Canada Office
Right-of-use asset, before accumulated amortization	96
Westminster, Canada Office
Right-of-use asset, before accumulated amortization	10
Toronto, Canada Office
Right-of-use asset, before accumulated amortization	950
Ratingen, Germany Office
Right-of-use asset, before accumulated amortization	92
Berlin, Germany Office
Right-of-use asset, before accumulated amortization	549
Slough, United Kingdom Office
Right-of-use asset, before accumulated amortization	$ 34