Other Assets - Additional Information (Detail) |
12 Months Ended |
|---|---|
Dec. 31, 2018 | |
| Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] | |
| Period of not utilizing deferred share issuance costs and prepaid amounts related to insurance | 12 months |
| X | ||||||||||
- Definition Period of not utilizing deferred share issuance costs and prepaid amounts related to insurance. No definition available.
|
| X | ||||||||||
- References No definition available.
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