Summary of Significant Accounting Policies - Asset Retirement Obligations (Details) |
Dec. 31, 2017
USD ($)
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| Accounting Policies [Abstract] | |
| Asset retirement obligation | $ 0 |
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- References No definition available.
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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