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Income Taxes - Reconciliation of the differences between PRC statutory income tax rate and the Group's effective income tax rate for PRC operations (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of income taxes
Tax deductible expenses of the research and development expenses (in percent)	175.00%	175.00%	150.00%
PRC
Schedule of income taxes
Statutory income tax rate	25.00%	25.00%	25.00%
Permanent differences	18.00%	46.20%	(10.10%)
Change in valuation allowance	(33.00%)	(77.20%)	2.90%
Effect of preferential tax treatment	(18.70%)	(37.50%)	(6.60%)
Uncertain tax positions	(0.70%)	(3.30%)	2.90%
Effective income tax rate	(9.40%)	(46.80%)	14.10%

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 permanent differences, which mainly included the tax- deductible expenses of the research and development expenses.

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Schedule of income taxes [Line Items]

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The percentage of tax deductible expenses on research and development expenses.

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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 attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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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 income exempt from income tax because of a tax holiday.

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