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Government Grants (Details)
¥ in Thousands, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 13 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
CNY (¥)
item
Dec. 31, 2014
USD ($)
item
Sep. 30, 2017
USD ($)
China carbon reactivation lines construction commitment incentive                  
Government Grants                  
Incentive received         ¥ 3,860 $ 0.6 ¥ 3,860 $ 0.6  
Number of phases within which the construction of carbon reactivation lines has been committed to be completed | item             2 2  
Incentive recognized $ 0.0 $ 0.0 $ 0.0 $ 0.0          
China carbon reactivation lines construction commitment incentive | Accrued pension and other liabilities                  
Government Grants                  
Unearned portion of incentives 0.9   0.9     $ 0.8     $ 0.9
U.S. government Agency manufacturing agreement                  
Government Grants                  
Funding received                 0.0
U.S. government Agency manufacturing agreement | Maximum                  
Government Grants                  
Total award amount $ 15.4   $ 15.4           $ 15.4