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Acquisitions - Summary of Preliminary Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jul. 06, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets: |  |  |
Goodwill | $ 85,126 |  | $ 76,169
FeedbackNow [Member] |  |  |
Assets: |  |  |
Cash |  | $ 463 |
Accounts receivable |  | 846 |
Prepaids and other current assets |  | 465 |
Goodwill |  | 9,087 |
Acquired intangible assets |  | 4,780 |
Other assets |  | 75 |
Total assets |  | 15,716 |
Liabilities: |  |  |
Accounts payable and accrued liabilities |  | 908 |
Contract liabilities |  | 260 |
Deferred tax liability |  | 825 |
Total liabilities |  | 1,993 |
Net assets acquired |  | $ 13,723 |

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