Business Segment, Geographic and Major Customer Information (Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net revenue from external customers	$ 70,604	$ 64,337	$ 64,079	$ 63,812	$ 63,863	$ 74,048	$ 71,949	$ 60,106	$ 262,832	$ 269,966	$ 319,852
Gross margin	$ 22,812	$ 22,354	$ 21,718	$ 23,794	$ 24,609	$ 27,339	$ 24,552	$ 19,806	90,678	96,306	130,764
Income (loss) from operations									(7,304)	12,278	58,619
Depreciation and amortization									10,429	8,735	7,713
Capital expenditures									13,960	16,391	9,339
Operating Segments | Energy Chemistry Technologies
Segment Reporting Information [Line Items]
Net revenue from external customers									188,233	213,592	268,761
Gross margin									74,592	81,935	117,867
Income (loss) from operations									29,014	43,902	84,846
Depreciation and amortization									5,935	4,791	4,401
Capital expenditures									10,674	12,803	6,983
Operating Segments | Consumer and Industrial Chemistry Technologies
Segment Reporting Information [Line Items]
Net revenue from external customers									74,599	56,374	51,091
Gross margin									16,086	14,371	12,897
Income (loss) from operations									9,664	8,742	6,558
Depreciation and amortization									2,257	2,202	2,138
Capital expenditures									888	568	115
Corporate and Other
Segment Reporting Information [Line Items]
Net revenue from external customers									0	0	0
Gross margin									0	0	0
Income (loss) from operations									(45,982)	(40,366)	(32,785)
Depreciation and amortization									2,237	1,742	1,174
Capital expenditures									$ 2,398	$ 3,020	$ 2,241