Business Segment, Geographic and Major Customer Information - Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Summarized financial information regarding reportable segments
Net revenue from external customers	$ 21,879	$ 53,709	$ 99,827	$ 134,324
Loss from operations	(11,853)	(4,080)	(39,976)	(60,446)
Depreciation and amortization	2,058	2,259	6,437	6,935
Capital expenditures	1,102	1,163	1,869	3,794
Operating Segments \| Energy Chemistry Technologies
Summarized financial information regarding reportable segments
Net revenue from external customers	21,879	53,709	99,827	134,324
Loss from operations	(5,984)	3,921	(18,968)	(34,176)
Depreciation and amortization	1,870	1,734	5,588	5,300
Capital expenditures	1,102	302	1,869	2,480
Corporate and Other
Summarized financial information regarding reportable segments
Net revenue from external customers	0	0	0	0
Loss from operations	(5,869)	(8,001)	(21,008)	(26,270)
Depreciation and amortization	188	525	849	1,635
Capital expenditures	$ 0	$ 861	$ 0	$ 1,314

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.

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