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Profit Appropriation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Profit Appropriation [Line Items]      
Required percentage of after-tax-profit under PRC GAAP to be set aside as statutory surplus fund 10.00%    
Required registered capital ratio to de-force compulsory net profit allocation to statutory surplus fund 50.00%    
Total amount of profits contributed to funds $ 0.1 $ 0.4 $ 10.4
Total balance of profits contributed to funds $ 57.2 $ 81.1  
China Foreign Investment Enterprises Law [Member] | Minimum [Member]      
Profit Appropriation [Line Items]      
Required percentage of after-tax-profit under PRC GAAP to be set aside as a general reserve fund 10.00%    
Required registered capital ratio to de-force compulsory net profit allocation to general reserve fund 50.00%    
China Company Law [Member] | Minimum [Member]      
Profit Appropriation [Line Items]      
Required percentage of after-tax-profit under PRC GAAP to be set aside as statutory surplus fund 10.00%    
Required registered capital ratio to de-force compulsory net profit allocation to statutory surplus fund 50.00%