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Income tax (Reconciliation of the Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax [Line Items]
Statutory income tax rate	25.00%	25.00%	25.00%
Share-based compensation	8.36%	23.47%	(36.68%)
Effect on tax rates in different tax jurisdiction	(1.01%)	(15.88%)	(0.52%)
Tax incentives relating to research and development expenditure	(8.87%)	(17.00%)	5.62%
Other non-deductible expenses	0.78%	0.60%	(1.59%)
Changes in valuation allowance	(7.80%)	(38.63%)	4.87%
Effective income tax rate	16.46%	(22.44%)	(3.30%)

X

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to share based compensation cost (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax incentives relating to research and development expenditure.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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