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COMMITMENTS AND CONTINGENCIES - Commitments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Property, plant and equipment  
Purchase Commitment, Excluding Long-term Commitment [Line Items]  
Commitments $ 12,000
2020 9,000
2021 3,000
Total 12,000
Solar power system  
Purchase Commitment, Excluding Long-term Commitment [Line Items]  
Commitments 800
2020 600
2021 200
Total $ 800