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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 Segment
Summary Of Significant Accounting Policies [Line Items] |
Maximum period of investments with original maturities from date of acquisition to be cash equivalents | 3 months
Number of business segments | 1
Minimum [Member] |
Summary Of Significant Accounting Policies [Line Items] |
Estimated useful lives | 3 years
Maximum [Member] |
Summary Of Significant Accounting Policies [Line Items] |
Estimated useful lives | 7 years

X
- Definition The entity considers investments with original maturities of certain months or less at the date of acquisition to be cash equivalents. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Summary of significant accounting policies. + References No definition available. + Details
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X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
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Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |