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Intangible assets, net - Summary of Estimated Amortization Expense on Intangible Assets (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2015 $ 1,034
2016 882
2017 730
2018 606
2019 491
Thereafter $ 468