Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers

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Revenue from Contracts with Customers
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers
4. Revenue from Contracts with Customers:
Disaggregated Revenue
The Company’s primary means of disaggregating revenues is by reportable segments, which can be found in Note 18 to these condensed consolidated financial statements.
The Company’s portfolio of products is integrated into a variety of end uses, which are described in the table below.
Key End Uses Key Products
Industrial & process chemicals • Sulfur derivatives for industrial production
• Treatment services
Fuels & emission control • Refining catalysts
• Emission control catalysts
• Catalyst recycling services
Packaging & engineered plastics • Catalysts for high-density polyethlene and chemicals syntheses
• Antiblock for film packaging
• Sulfur derivatives for nylon production
Natural resources • Sulfur derivatives for mining
The following tables disaggregate the Company’s sales, by segment and end use, for the three months ended March 31, 2021 and 2020:
Three months ended March 31, 2021
Refining
Services		 Catalysts Total
Industrial & process chemicals $ 16,947  $ —  $ 16,947 
Fuels & emission control(1)
55,192  —  55,192 
Packaging & engineered plastics 10,622  26,402  37,024 
Natural resources 17,461  —  17,461 
Total segment sales 100,222  26,402  126,624 

Three months ended March 31, 2020
Refining
Services		 Catalysts Total
Industrial & process chemicals $ 19,359  $ 47  $ 19,406 
Fuels & emission control(1)
55,710  —  55,710 
Packaging & engineered plastics 10,734  24,817  35,551 
Natural resources 14,887  —  14,887 
Total segment sales 100,690  24,864  125,554 

(1)As described in Note 1, the Company experiences seasonal sales fluctuations to customers in the fuels & emission control end use.
Contract Assets and Liabilities
A contract asset is a right to consideration in exchange for goods that the Company has transferred to a customer when that right is conditional on something other than the passage of time. A contract liability exists when the Company receives consideration in advance of performance obligations being satisfied. The Company has no contract assets or liabilities on its condensed consolidated balance sheets as of March 31, 2021 and December 31, 2020.