Business Segment, Geographic and Major Customer Information - Major Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue, Major Customer
Revenue	$ 53,141	$ 119,353
Customer Concentration Risk | Sales | Customer A | Chemistry Technologies
Revenue, Major Customer
Revenue	$ 12,891	$ 24,386
Percentage of revenue by major customers (in percentage)	24.26%	20.43%
Customer Concentration Risk | Sales | Customer B | Chemistry Technologies
Revenue, Major Customer
Revenue		$ 12,322
Percentage of revenue by major customers (in percentage)		10.32%
Customer Concentration Risk | Sales | Customer C | Chemistry Technologies
Revenue, Major Customer
Revenue	$ 9,394
Percentage of revenue by major customers (in percentage)	17.68%