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Acquisitions Details (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 06, 2021 | Mar. 26, 2021 | Dec. 13, 2019 | Apr. 30, 2020 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 22, 2018 | Nov. 01, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  |  |  | $ 5,772,000 | $ (128,000) |  | $ 1,190,000 |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  |  | 15,684,000 | 14,334,000 |  |  |  |  |  |  |  |  |
Operating lease liabilities |  |  |  |  |  |  |  | 18,368,000 | 16,193,000 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 225,522,000 | 210,135,000 |  | 153,422,000 |  |  |  |  |  |  |
Opengear |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  |  | $ 148,058,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life identifiable intangibles |  |  | 13 years 4 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 57,088,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets |  |  |  |  |  |  |  | (1,100,000) |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |
Opengear | General and Administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  | 300,000 | 2,700,000 |  | 300,000 |  |  |  |  |  |  |
Haxiot |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  | $ 7,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 8,605,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Haxiot | General and Administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |
Ctek |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing | $ 12,012,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 4,867,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ctek | General and Administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life identifiable intangibles |  |  |  |  |  |  |  | 14 years 6 months |  |  |  |  |  |  |  |  |  |
Earn-out payments | Opengear | 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |
Earn-out payments | Opengear | 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |
Earn-out payments | Forecast | Haxiot | 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Earn-out payments | Forecast | Haxiot | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,900,000 |  |  |  |
Earn-out payments | Forecast | Ctek | 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |
Earn-out payments | Forecast | Ctek | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |
Earn-out payments | Forecast | Ctek | 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |
Customer Relationships | Opengear |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life identifiable intangibles |  |  | 14 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased and Core Technology | Opengear |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life identifiable intangibles |  |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks | Opengear |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life identifiable intangibles |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-current assets | Opengear |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities and other non-current liabilities | Opengear |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease liabilities |  |  | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration | Opengear |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  | $ 10,000,000 | $ 900,000 |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  | $ 2,400,000 |  |  |  |  |  |  | $ 3,500,000 |  |  |  |  |  |  |
Contingent Consideration | TempAlert |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  |  | $ 6,200,000 | $ 4,228,000 |  |  |  |  |  |  |  |  |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300,000 |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration | TempAlert |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0

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