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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 296,570   $ 296,570   $ 287,904
Less accumulated depreciation (108,461)   (108,461)   (100,800)
Total property, plant and equipment, net 188,109   188,109   187,104
Capitalized labor costs 100 $ 100 400 $ 100  
Amortization relating to the platinum catalyst 200 $ 200 500 $ 400  
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 276,223   276,223   270,149
Construction in progress          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 9,041   $ 9,041   $ 6,422