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Impairment - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Impaired Long-Lived Assets Held and Used [Line Items]            
Assets at carrying value $ 181,773,000     $ 181,773,000   $ 146,671,000
Impairment of long-lived assets 0 $ 0   0 $ 26,103,000  
Advanced Purification Technologies            
Impaired Long-Lived Assets Held and Used [Line Items]            
Assets, total     $ 54,700,000      
Assets at carrying value     58,300,000      
Impairment of long-lived assets     26,103,000      
Operating Segments            
Impaired Long-Lived Assets Held and Used [Line Items]            
Assets at carrying value 91,044,000     91,044,000   92,393,000
Operating Segments | Advanced Purification Technologies            
Impaired Long-Lived Assets Held and Used [Line Items]            
Assets at carrying value $ 83,862,000     83,862,000   $ 80,877,000
Assets at fair value     32,200,000      
Impairment of long-lived assets     $ 26,100,000      
Expected impairment charge       $ 0