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Acquisition - Additional Information (Detail) - CaseStack, Inc. [Member] - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Dec. 03, 2018 | Apr. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |
Consideration for transaction | $ 252,858 |  |  |  |
Business acquisition, cash paid | 249,389 | $ 700 | $ 248,700 |  |
Deferred purchase consideration | $ 3,469 |  |  |  |
Deferred purchase consideration payable term | 24 months |  |  |  |
Amortization expense of intangible assets |  |  |  | $ 2,300 | $ 6,900
Intangible assets, weighted average useful life |  |  |  |  | 9 years

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