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Revenue - Additional Information (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]    
Revenue from products and services transferred to customers   2.00%
Revenue from Contract with Customer | Product Concentration Risk | Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Revenue from products and services transferred to customers 95.00% 95.00%
Revenue from Contract with Customer | Product Concentration Risk | Transferred over Time    
Disaggregation of Revenue [Line Items]    
Revenue from products and services transferred to customers 5.00% 5.00%