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Business Acquisitions - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2022 | Feb. 04, 2022
Business Acquisition [Line Items] |  |  |  |  |
Deferred revenue acquired |  | $ 0 |  |  |
Goodwill acquired | $ 5,677,000 |  |  |  |
Goodwill | 346,585,000 | 339,209,000 | $ 342,430,000 |  |
Summit Healthcare Services, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue of acquiree since acquisition date | 6,800,000 |  |  |  |
Consideration transferred | 12,200,000 |  |  |  |
Working capital adjustment, decrease acquisition purchase price | 2,100,000 |  |  |  |
Deferred revenue related to acquisition | 1,300,000 |  |  |  |
Deferred revenue acquired | 4,800,000 |  |  |  | $ 4,839,000
Goodwill acquired | 5,700,000 |  |  |  |
Expected income tax deductible amount | $ 5,700,000 |  |  |  |
Goodwill |  |  |  |  | $ 5,677,000
Summit Healthcare Services, Inc. | Accounting Standards Update 2021-08 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Deferred revenue acquired |  |  |  | $ 900,000 |
SRFax |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue of acquiree since acquisition date |  |  | 7,300,000 |  |
Consideration transferred |  |  | 25,000,000 |  |
SEOmoz | Discontinued Operations |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue of acquiree since acquisition date |  | 14,400,000 |  |  |
Consideration transferred |  | $ 66,500,000 |  |  |
Inspired eLearning | Discontinued Operations |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue of acquiree since acquisition date |  |  | 1,600,000 |  |
Consideration transferred |  |  | $ 20,500,000 |  |

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