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Legal Proceedings - Narrative (Details)
Unit in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 29, 2019
USD ($)
Dec. 11, 2018
Lawsuit
Dec. 10, 2018
Lawsuit
patent
Nov. 14, 2017
Lawsuit
patent
Jul. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Unit
Sep. 30, 2018
USD ($)
Loss Contingencies [Line Items]                  
Recognized gain on litigation settlement           $ 0 $ 0 $ 51,000 $ 0
Lawsuit Against 3Shape AS                  
Loss Contingencies [Line Items]                  
Number of lawsuits/complaints | Lawsuit     3 6          
Patents Allegedly Infringed upon | patent     10 26          
Violation Of Trade Laws 3Shape                  
Loss Contingencies [Line Items]                  
Number of lawsuits/complaints | Lawsuit       2          
Patent Infringement By 3Shape                  
Loss Contingencies [Line Items]                  
Number of lawsuits/complaints | Lawsuit   2   4          
Straumann Group                  
Loss Contingencies [Line Items]                  
Proceeds from Legal Settlements $ 35,000       $ 16,000        
Term of Global Development and Distribution agreement               5 years  
Payment in lieu of Global Development and Distribution agreement           $ 16,000   $ 16,000  
Recognized gain on litigation settlement               $ 51,000  
iTero Element Scanners | Straumann Group                  
Loss Contingencies [Line Items]                  
Number of scanners | Unit               5