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Taxation (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory income tax rate of the PRC	25.00%	25.00%	25.00%
Permanent differences	(10.40%)	(11.50%)	(7.70%)
Change in valuation allowance	(14.60%)	(13.50%)	(17.30%)
Effective income tax rate	0.00%	0.00%	0.00%

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- Definition

Represents the percentage of Permanent differences during the indicated time period.

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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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