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Revenues - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]          
Recognized service revenue $ 7.6 $ 7.8 $ 29.2 $ 29.8  
Refund liability 0.1 $ 0.1 $ 0.1 $ 0.1  
Minimum          
Disaggregation of Revenue [Line Items]          
Extended product warranty term     1 month    
Maximum          
Disaggregation of Revenue [Line Items]          
Extended product warranty term     3 years    
Commissions          
Disaggregation of Revenue [Line Items]          
Capitalized contract cost, gross 3.4   $ 3.4   $ 4.1
Prepaid expenses and other current assets | Commissions          
Disaggregation of Revenue [Line Items]          
Capitalized contract cost, gross 2.1   2.1   2.6
Other long-term assets | Commissions          
Disaggregation of Revenue [Line Items]          
Capitalized contract cost, gross $ 1.3   $ 1.3   $ 1.5