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Segment and Geographical Information - Percentage of Sales to Significant Customers (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue, Major Customer [Line Items]      
Percentage of Sales 100.00% 100.00% 100.00%
Sales | Customer Concentration Risk | Eastman Chemical Company      
Revenue, Major Customer [Line Items]      
Percentage of Sales     20.00%
Sales | Customer Concentration Risk | Nantong Cellulose Fibers, Co., Ltd.      
Revenue, Major Customer [Line Items]      
Percentage of Sales     15.00%
Sales | Customer Concentration Risk | Daicel Corporation      
Revenue, Major Customer [Line Items]      
Percentage of Sales     10.00%