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Goodwill
6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
8. Goodwill:
The change in the carrying amount of goodwill for the six months ended June 30, 2021 is summarized as follows:
 EcoservicesCatalyst TechnologiesTotal
Balance as of December 31, 2020$311,892 $79,673 $391,565 
Goodwill recognized (Note 7)37,646 — 37,646 
Foreign exchange impact— 494 494 
Balance as of June 30, 2021$349,538 $80,167 $429,705