Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions |
12 Months Ended | ||
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Dec. 31, 2018
USD ($)
Segment
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Dec. 31, 2017
Segment
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Dec. 31, 2016
Segment
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| Business Description And Basis Of Presentation [Line Items] | |||
| Number of operating segments | Segment | 1 | 1 | 1 |
| Recognized amounts due from contracts with customer | $ | $ 0.5 | ||
| X | ||||||||||
- Definition Business Description And Basis Of Presentation [Line Items] No definition available.
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| X | ||||||||||
- Definition Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. No definition available.
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