Business Segment, Geographic and Major Customer Information - Major Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information
Revenue from external customers	$ 8,847	$ 12,739	$ 29,782	$ 41,035
Revenue from related party	1,332	0	1,332	0
Customer Concentration Risk | Sales | Customer D | Chemistry Technologies
Segment Reporting Information
Revenue from external customers	$ 3,041	$ 4,632	$ 7,701	$ 8,117
Percentage of revenue by major customers (in percentage)	29.90%	36.20%	24.80%	19.80%
Customer Concentration Risk | Sales | Customer E - Related party | Chemistry Technologies
Segment Reporting Information
Revenue from related party	$ 1,332
Percentage of revenue by major customers (in percentage)	13.10%
Customer Concentration Risk | Sales | Customer C | Chemistry Technologies
Segment Reporting Information
Revenue from external customers		$ 2,088	$ 4,067	$ 10,412
Percentage of revenue by major customers (in percentage)		16.40%	13.10%	25.40%
Customer Concentration Risk | Sales | Customer A | Chemistry Technologies
Segment Reporting Information
Revenue from external customers				$ 3,631
Percentage of revenue by major customers (in percentage)				8.90%