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Intangible asset, net - Summary of Intangible Asset (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Cost $ 659 $ 659
Accumulated amortization (312) (92)
Net intangible asset $ 347 $ 567
Intangible asset useful life 3 years  
Expected amortization expense 2021 $ 200  
Expected amortization expense 2022 $ 100