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Income Taxes - Reconciliation of the differences between statutory income tax rate and the effective income tax rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation
Statutory EIT rate	25.00%	25.00%	25.00%
Effect of non-deductible expenses	(386.74%)	3.28%	16.59%
Tax incentives for research and development expense	111.56%	(7.35%)	(6.93%)
Tax incentives for wages of disabled staff	9.89%	(0.36%)	(1.56%)
Change in valuation allowance	(154.03%)	5.82%
Non-taxable item	47.58%
Tax rate difference from statutory rate in other jurisdictions	7.45%	0.40%
Others	8.72%		(0.06%)
Effective income tax rate	(330.57%)	26.79%	33.04%
Percentage of tax incentives on research and development expenses	175.00%	175.00%	150.00%

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 tax incentives for research and development expenses.

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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 for wages of disabled staff

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Percentage of Non Taxable Item, Percentage

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Represents the percentage on tax incentives on tax deductible 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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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