Business Segment, Geographic and Major Customer Information - Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Summarized financial information regarding reportable segments
Net revenue from external customers	$ 59,086	$ 85,177	$ 119,602	$ 165,131
Income (loss) from operations	(46,501)	(1,252)	(53,286)	(1,874)
Depreciation and amortization	3,025	2,991	6,027	6,023
Capital expenditures	1,441	2,631	3,227	4,508
Operating Segments \| Energy Chemistry Technologies
Summarized financial information regarding reportable segments
Net revenue from external customers	39,546	65,875	80,615	126,640
Income (loss) from operations	(37,929)	9,299	(38,095)	17,848
Depreciation and amortization	1,797	1,795	3,566	3,644
Capital expenditures	1,167	1,956	2,178	2,470
Operating Segments \| Consumer and Industrial Chemistry Technologies
Summarized financial information regarding reportable segments
Net revenue from external customers	19,540	19,302	38,987	38,491
Income (loss) from operations	640	1,216	3,078	4,921
Depreciation and amortization	682	583	1,351	1,162
Capital expenditures	187	397	596	897
Corporate and Other
Summarized financial information regarding reportable segments
Net revenue from external customers	0	0	0	0
Income (loss) from operations	(9,212)	(11,767)	(18,269)	(24,643)
Depreciation and amortization	546	613	1,110	1,217
Capital expenditures	$ 87	$ 278	$ 453	$ 1,141

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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