Business Segment, Geographic and Major Customer Information - Major Customers (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information
Revenue from external customers	$ 39,627	$ 53,141
Customer Concentration Risk \| Sales \| Customer A \| Chemistry Technologies
Segment Reporting Information
Revenue from external customers	$ 4,067	$ 12,891
Percentage of revenue by major customers (in percentage)	9.00%	24.00%
Customer Concentration Risk \| Sales \| Customer B \| Chemistry Technologies
Segment Reporting Information
Revenue from external customers	$ 11,632	$ 9,394
Percentage of revenue by major customers (in percentage)	26.00%	18.00%

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details