Business Segment, Geographic and Major Customer Information - Assets by Reportable Segments (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 136,774,000	$ 230,600,000	$ 247,868,000	$ 262,260	$ 281,051
Operating Segments | Energy Chemistry Technologies
Segment Reporting Information [Line Items]
Total assets	45,883,000	116,110,000
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	90,891,000	114,490,000
Total assets
Segment Reporting Information [Line Items]
Total assets	$ 136,774,000	$ 230,600,000