Business Segment, Geographic and Major Customer Information - Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Summarized financial information regarding reportable segments
Net revenue from external customers	$ 43,256	$ 41,069
Income (loss) from operations	(14,266)	(9,223)
Depreciation and amortization	2,260	2,333
Capital expenditures	461	1,377
Operating Segments \| Energy Chemistry Technologies
Summarized financial information regarding reportable segments
Net revenue from external customers	43,256	41,069
Income (loss) from operations	(5,334)	(166)
Depreciation and amortization	1,785	1,769
Capital expenditures	461	1,011
Corporate and Other
Summarized financial information regarding reportable segments
Net revenue from external customers	0	0
Income (loss) from operations	(8,932)	(9,057)
Depreciation and amortization	475	564
Capital expenditures	$ 0	$ 366

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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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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