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Cash Equivalents and Investments - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2018 USD ($)
Cash Cash Equivalents And Short Term Investments [Line Items] |
Investment in continuous unrealized loss position for more than one year | $ 0
Maximum [Member] |
Cash Cash Equivalents And Short Term Investments [Line Items] |
Available for sale securities contractual maturity period | 1 year

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- Definition Available for sale securities contractual maturity period. + References No definition available. + Details
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- Definition Cash and cash equivalents and short term investments. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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