Taxes (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Taxes (Details) [Line Items]
Corporate income tax rate	25.00%
R&D expense approved by local tax authority deducted from tax income	175.00%
Value added tax, description	The applicable VAT rate is 13% for products sold in the PRC.
Tax payables	$ 2.6	$ 2.5
Accrued tax liabilities	$ 2.6	$ 2.5
Beijing REIT [Member]
Taxes (Details) [Line Items]
Favorable income tax rate	15.00%

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Value added tax, description.

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

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations attributable to deduction. Includes, but is not limited to, dividend deduction, deduction for dividend paid to employee stock ownership plan (ESOP), Medicare prescription drug benefit subsidy deduction, and other deductions.

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes.

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