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Intangible Assets, net - Schedule of future amortization expense of intangible assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 792  
2022 792  
2023 792  
2024 792  
2025 792  
Thereafter 4,293  
Total $ 8,253 $ 9,046