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Taxes - Reconciles PRC statutory rates (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Taxes
Statutory PRC income tax rate	25.00%	25.00%	25.00%
Favorable tax rate impact	(17.00%)	(14.00%)	(11.00%)
Permanent difference and others	1.00%	(5.00%)	4.00%
Changes of deferred tax assets valuation allowances	(38.00%)	0.00%	(22.00%)
Total	(29.00%)	6.00%	(4.00%)

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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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-Publisher FASB
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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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