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CHINA JOINT VENTURE - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Noncontrolling Interest [Line Items]            
Required capital contribution           $ 357
Contributions from non-controlling interest     $ 148 $ 195 $ 148  
Chinese Supplier            
Noncontrolling Interest [Line Items]            
Ownership interest           51.00%
Corporate Joint Venture            
Noncontrolling Interest [Line Items]            
Contributions from non-controlling interest $ 0 $ 203 $ 154 $ 203 $ 154