Property, Plant and Equipment - Additional Information (Detail) - USD ($) |
3 Months Ended | |
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Mar. 31, 2017 |
Mar. 31, 2016 |
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| Development Expenses [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Depreciation expense | $ 60,000 | $ 0 |
| Australia [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Reserves | 0 | |
| Depletion | $ 0 | |
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- Definition Oil and gas reserve. No definition available.
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- Definition The noncash expense charged against earnings to recognize the consumption of natural resources. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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