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Impairment - Components (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Impaired Long-Lived Assets Held and Used [Line Items]          
Total impairment $ 0 $ 0   $ 0 $ 26,103
Advanced Purification Technologies          
Impaired Long-Lived Assets Held and Used [Line Items]          
Property, plant and equipment, net     $ 18,986    
Intangible assets, net     1,445    
Other long-term assets, net     5,672    
Total impairment     $ 26,103