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Commitments and contingencies (Details 1) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of Commitments and contingencies [Line Items] |  |  |
Minimum lease payments receivable under cancellable operating lease | $ 543 | $ 935 | $ 1,277
Within 1 year |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Minimum lease payments receivable under cancellable operating lease | 300 | 289 | 455
After 1 year but not more than 5 years |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Minimum lease payments receivable under cancellable operating lease | $ 243 | $ 646 | $ 822

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