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Business Segment, Geographic and Major Customer Information (Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 19,526	$ 21,879	$ 34,692	$ 43,256	$ 43,449	$ 53,709	$ 39,546	$ 41,069	$ 119,353	$ 177,773	$ 243,106
Loss from operations	$ (36,647)	$ (11,853)	$ (13,859)	$ (14,266)	$ (9,368)	$ (4,080)	$ (47,140)	$ (9,223)	(76,625)	(69,811)	(10,320)
Depreciation and amortization									8,465	9,216	9,768
Capital expenditures									2,411	3,559	4,197
Operating Segments \| Energy Chemistry Technologies
Segment Reporting Information [Line Items]
Revenue									119,353	177,773	243,106
Loss from operations									(46,485)	(36,817)	33,611
Depreciation and amortization									7,439	7,107	7,323
Capital expenditures									2,411	2,733	3,279
Corporate and Other
Segment Reporting Information [Line Items]
Revenue									0	0	0
Loss from operations									(30,140)	(32,994)	(43,931)
Depreciation and amortization									1,026	2,109	2,445
Capital expenditures									$ 0	$ 826	$ 918