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Nature of Expenses Allocated by Function - Restructuring Liabilities of China Operations (Details) - Restructuring of China Operations - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Restructuring Reserve [Roll Forward]        
Restructuring liability - January 1, 2017   $ 432,000 $ 0 $ 0
Restructuring charges $ 0   $ 3,300,000 3,299,000
Amounts paid   $ (400,000)   (2,855,000)
Other       (12,000)
Restructuring liability - December 31, 2017       $ 432,000