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Additional Information-Financial Statement Schedule I Condensed Financial Information of Parent Company - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2019
Condensed Financial Statements, Captions [Line Items]      
Par value of ordinary shares $ 2    
Retrospective adjustment to addition paid-in capital for subscription receivable 2    
Before adjustment      
Condensed Financial Statements, Captions [Line Items]      
Par value of ordinary shares 16    
Subscription receivable $ 16    
Parent      
Condensed Financial Statements, Captions [Line Items]      
Par value of ordinary shares   $ 2  
Subscription receivable   0  
Retrospective adjustment to addition paid-in capital for subscription receivable   2  
Parent | Before adjustment      
Condensed Financial Statements, Captions [Line Items]      
Par value of ordinary shares   16  
Subscription receivable   $ 16  
Parent | KAG      
Condensed Financial Statements, Captions [Line Items]      
Percentage of issued and outstanding shares acquired     100.00%