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Goodwill and Intangible Assets, net - Schedule of future amortization expense of intangible assets (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 1,558
2020 1,446
2021 1,446
2022 1,446
2023 1,446
Thereafter 10,726
Total $ 18,068