Business Segment, Geographic and Major Customer Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Financial information regarding reportable segments

Summarized financial information of the reportable segments is as follows (in thousands):

As of and for the year ended December 31,	Energy Chemistry Technologies			Corporate and Other			Total
2018
Net revenue from external customers	$	177,773		$	—		$	177,773
Income (loss) from operations	(36,817		)	(32,994		)	(69,811		)
Depreciation and amortization	7,107			2,109			9,216
Capital expenditures	2,733			826			3,559
2017
Net revenue from external customers	$	243,106		$	—		$	243,106
Income (loss) from operations	33,611			(43,931		)	(10,320		)
Depreciation and amortization	7,323			2,445			9,768
Capital expenditures	3,279			918			4,197
2016
Net revenue from external customers	$	188,233		$	—		$	188,233
Income (loss) from operations	29,014			(45,982		)	(16,968		)
Depreciation and amortization	5,935			2,237			8,172
Capital expenditures	10,674			2,398			13,072

Assets of the Company by reportable segments are as follows (in thousands):

	December 31, 2018		December 31, 2017
Energy Chemistry Technologies	$	139,205	$	172,799
Corporate and Other	28,208		35,871
Total segments	167,413		208,670
Held for sale	118,470		121,218
Total assets	$	285,883	$	329,888

Revenue by geographic location

Revenue by geographic location is as follows (in thousands):

	Year ended December 31,
	2018		2017		2016
U.S.	$	146,421	$	219,517	$	164,596
Other countries	31,352		23,589		23,637
Total	$	177,773	$	243,106	$	188,233

Revenue by major customers

Revenue from major customers, as a percentage of consolidated revenue, is as follows:

	Year ended December 31,
	2018	2017	2016
Customer A	12.2%	*	*
Customer B	10.1%	*	16.4%
Customer C	*	16.7%	21.9%