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Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jul. 31, 2018
Commitments And Contingencies Disclosure [Abstract] |  |  |
Accrued other long-term liabilities | $ 3.9 |  |
Estimated sales and marketing expense | $ 0.3 | $ 0.3 |
Freezing amount in cash resulted from court pending legal action issued |  |  | $ 2.5

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- Definition Estimated sales and marketing expense + References No definition available. + Details
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X
- Definition Freezing amount in cash resulted from court pending legal action issued. + References No definition available. + Details
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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