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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 43,449	$ 53,709	$ 39,546	$ 41,069	$ 55,299	$ 61,167	$ 65,875	$ 60,765	$ 177,773	$ 243,106	$ 188,233
Income (loss) from operations	$ (9,368)	$ (4,080)	$ (47,140)	$ (9,223)	$ 563	$ (4,088)	$ (2,469)	$ (4,326)	(69,811)	(10,320)	(16,968)
Depreciation and amortization									9,216	9,768	8,172
Capital expenditures									3,559	4,197	13,072
Operating Segments \| Energy Chemistry Technologies
Segment Reporting Information [Line Items]
Revenue									177,773	243,106	188,233
Income (loss) from operations									(36,817)	33,611	29,014
Depreciation and amortization									7,107	7,323	5,935
Capital expenditures									2,733	3,279	10,674
Corporate and Other
Segment Reporting Information [Line Items]
Revenue									0	0	0
Income (loss) from operations									(32,994)	(43,931)	(45,982)
Depreciation and amortization									2,109	2,445	2,237
Capital expenditures									$ 826	$ 918	$ 2,398