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Balance Sheet Account Details - Narrative - Warranties (Details)
9 Months Ended
Sep. 30, 2018
Instruments  
Product Warranty Liability [Line Items]  
Warranty period 1 year
Consumables | Minimum  
Product Warranty Liability [Line Items]  
Warranty period 6 months
Consumables | Maximum  
Product Warranty Liability [Line Items]  
Warranty period 12 months