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COMMITMENTS AND CONTINGENCIES - Legal Proceedings (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
product
Commitments and contingencies  
Accrued loss contingencies | $ $ 2,300
TCCC  
Commitments and contingencies  
Related Party Ownership Interest (as a percent) 18.70%
Number of energy products developed | product 3