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Business Combinations - Summary of Preliminary Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 9,842 $ 8,552 $ 8,060
Xirrus Wi-Fi Business      
Business Acquisition [Line Items]      
Goodwill 1,782    
Deferred revenue (7,460)    
Other net assets acquired 2,468    
Total purchase price 5,000    
Xirrus Wi-Fi Business | Customer Relationships      
Business Acquisition [Line Items]      
Intangible assets 7,670    
Xirrus Wi-Fi Business | Unpatented Technology      
Business Acquisition [Line Items]      
Intangible assets $ 540