v3.10.0.1

Summary of significant accounting policies - Foreign currency translation (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Foreign Currency Translation |  |
Cumulative foreign currency translation adjustments, net of tax in accumulated other comprehensive income | $ (1,455) | $ (898)
Income tax effect related to foreign currency translation adjustments | $ 0 | $ 0

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