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Business Combinations - Schedule of Identifiable Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Aug. 27, 2021 | Aug. 09, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Allocation of Consideration transferred: |  |  |  |  |
Goodwill |  |  | $ 0 | $ 435,279 | $ 442,761
Silver Cloud Health Holdings, Inc. [Member] |  |  |  |  |
Purchase consideration: |  |  |  |  |
Cash consideration paid | $ 105,195 |  |  |  |
Stock consideration | 85,571 |  |  |  |
Contingent consideration | 29,360 |  |  |  |
Escrow share consideration | 6,376 |  |  |  |
Working capital adjustment | (300) |  |  |  |
Total consideration transferred | 226,202 |  |  |  |
Allocation of Consideration transferred: |  |  |  |  |
Accounts receivable | 2,630 |  |  |  |
Identifiable intangible assets | 78,146 |  |  |  |
Other assets | 491 |  |  |  |
Total assets acquired | 81,267 |  |  |  |
Current liabilities | 2,155 |  |  |  |
Deferred revenue | 5,813 |  |  |  |
Other long-term liabilities | 11,035 |  |  |  |
Total liabilities assumed | 19,003 |  |  |  |
Goodwill | 163,938 |  |  |  |
Total purchase consideration | $ 226,202 |  |  |  |
Conversa Health Inc. [Member] |  |  |  |  |
Purchase consideration: |  |  |  |  |
Cash consideration paid |  | $ 51,331 |  |  |
Stock consideration |  | 52,160 |  |  |
Contingent consideration |  | 15,230 |  |  |
Working capital adjustment |  | (127) |  |  |
Total consideration transferred |  | 118,594 |  |  |
Allocation of Consideration transferred: |  |  |  |  |
Accounts receivable |  | 3,651 |  |  |
Identifiable intangible assets |  | 34,700 |  |  |
Other assets |  | 4,604 |  |  |
Total assets acquired |  | 42,955 |  |  |
Current liabilities |  | 8,463 |  |  |
Deferred revenue |  | 4,655 |  |  |
Other long-term liabilities |  | 115 |  |  |
Total liabilities assumed |  | 13,233 |  |  |
Goodwill |  | 88,872 |  |  |
Total purchase consideration |  | $ 118,594 |  |  |

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