Quarterly report pursuant to Section 13 or 15(d)

PROPERTY, PLANT AND EQUIPMENT (Details)

v3.21.2
PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 299,932   $ 299,932   $ 287,904
Less accumulated depreciation (112,365)   (112,365)   (100,800)
Total property, plant and equipment, net 187,567   187,567   187,104
Capitalized labor costs 100 $ 100 500 $ 100  
Platinum catalyst metal          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 1,553   1,553   1,580
Catalyst          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 4,325   4,325   4,325
Land          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 5,428   5,428   5,428
Plant, pipeline and equipment          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 280,427   280,427   270,149
Construction in progress          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 8,199   $ 8,199   $ 6,422