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Fair Value Measurements - Additional Disclosures (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair Value Disclosures [Abstract]          
Cash and cash equivalents $ 97,509,000   $ 97,509,000   $ 3,044,000
Cash equivalents 46,600,000   46,600,000   0
Interest bearing demand deposit 45,200,000   45,200,000    
Cash 5,700,000   5,700,000   $ 3,000,000.0
Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]          
Impairment of goodwill $ 0 $ 37,180,000 $ 0 $ 37,180,000  
Energy Chemistry Technologies          
Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]          
Impairment of goodwill   $ 37,200,000