Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES (Details)

v3.20.1
COMMITMENTS AND CONTINGENCIES (Details)
ر.س in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
SAR (ر.س)
Mar. 31, 2020
SAR (ر.س)
Mar. 26, 2020
USD ($)
Mar. 26, 2020
SAR (ر.س)
Dec. 31, 2019
USD ($)
Oct. 24, 2010
Guarantor Obligations [Line Items]                  
Undelivered feedstock $ 2.7             $ 3.5  
Shortfall fee expenses 0.3 $ 0.2              
Expenses for environmental monitoring, compliance, and improvements 0.3 $ 0.1              
Saudi Industrial Development Fund Limited Guarantee                  
Guarantor Obligations [Line Items]                  
Loan guarantee (percentage)           33.10% 33.10%   41.00%
Amount of maximum exposure $ 77.3       ر.س 275.0 $ 24.3 ر.س 95.7    
Saudi Industrial Development Fund Limited Guarantee | Scenario, Forecast                  
Guarantor Obligations [Line Items]                  
Amount of maximum exposure     $ 13.3 ر.س 50.0