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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 |  |

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