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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Summary of other expenses due to related parties    
Total $ 72 $ 75
Chuzhou Huarui [Member]    
Summary of other expenses due to related parties    
Total 50 53
Kunshan Enjin [Member]    
Summary of other expenses due to related parties    
Total $ 22 $ 22