Business Segment, Geographic and Major Customer Information - Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Summarized financial information regarding reportable segments
Net revenue from external customers	$ 79,458	$ 64,337	$ 244,589	$ 192,227
Gross profit	21,740	22,354	75,573	67,865
Income (loss) from operations	(3,103)	(2,253)	(4,977)	(1,730)
Depreciation and amortization	3,068	2,730	9,091	7,380
Capital expenditures	1,647	2,380	6,155	10,618
Operating Segments | Energy Chemistry Technologies
Summarized financial information regarding reportable segments
Net revenue from external customers	61,167	45,030	187,807	133,094
Gross profit	18,733	18,180	63,840	54,609
Income (loss) from operations	6,867	6,196	24,715	21,793
Depreciation and amortization	1,863	1,582	5,507	4,062
Capital expenditures	324	2,005	2,794	8,704
Operating Segments | Consumer and Industrial Chemistry Technologies
Summarized financial information regarding reportable segments
Net revenue from external customers	18,291	19,307	56,782	59,133
Gross profit	3,007	4,174	11,733	13,256
Income (loss) from operations	985	2,433	5,906	8,508
Depreciation and amortization	590	567	1,752	1,685
Capital expenditures	682	148	1,580	494
Corporate and Other
Summarized financial information regarding reportable segments
Net revenue from external customers	0	0	0	0
Gross profit	0	0	0	0
Income (loss) from operations	(10,955)	(10,882)	(35,598)	(32,031)
Depreciation and amortization	615	581	1,832	1,633
Capital expenditures	$ 641	$ 227	$ 1,781	$ 1,420