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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes in the carrying value of goodwill
Changes in the carrying value of goodwill for each reporting unit are as follows (in thousands):
 
Energy Chemistry Technologies
 
Consumer and Industrial Chemistry Technologies
 
Total
Balance at December 31, 2017
$
37,180

 
$
19,480

 
$
56,660

Goodwill impairment recognized
(37,180
)
 
—

 
(37,180
)
Balance at September 30, 2018
$
—

 
$
19,480

 
$
19,480