Business Segment, Geographic and Major Customer Information - Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Summarized financial information regarding reportable segments
Net revenue from external customers	$ 34,692	$ 39,546	$ 77,949	$ 80,615
Income (loss) from operations	(13,859)	(47,140)	(28,122)	(56,364)
Depreciation and amortization	2,119	2,343	4,379	4,676
Capital expenditures	306	1,254	767	2,631
Operating Segments \| Energy Chemistry Technologies
Summarized financial information regarding reportable segments
Net revenue from external customers	34,692	39,546	77,949	80,615
Income (loss) from operations	(7,651)	(37,929)	(12,984)	(38,095)
Depreciation and amortization	1,933	1,797	3,718	3,566
Capital expenditures	306	1,167	767	2,178
Corporate and Other
Summarized financial information regarding reportable segments
Net revenue from external customers	0	0	0	0
Income (loss) from operations	(6,208)	(9,211)	(15,138)	(18,269)
Depreciation and amortization	186	546	661	1,110
Capital expenditures	$ 0	$ 87	$ 0	$ 453

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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