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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 | Dec. 31, 2018 | Jul. 06, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets: |  |  |  |
Goodwill | $ 85,165 |  | $ 76,169 | $ 73,193
FeedbackNow [Member] |  |  |  |
Assets: |  |  |  |
Cash |  | $ 463 |  |
Accounts receivable |  | 738 |  |
Prepaids and other current assets |  | 487 |  |
Goodwill |  | 9,513 |  |
Acquired intangible assets |  | 4,780 |  |
Other assets |  | 75 |  |
Total assets |  | 16,056 |  |
Liabilities: |  |  |  |
Accounts payable and accrued liabilities |  | 837 |  |
Contract liabilities |  | 298 |  |
Deferred tax liability |  | 825 |  |
Total liabilities |  | 1,960 |  |
Net assets acquired |  | $ 14,096 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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