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Intangible assets, net - Summary of Estimated Amortization Expense on Intangible Assets (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity  
2018 $ 882
2019 730
2020 606
2021 491
2022 363
Thereafter $ 106