Income Taxes - Additional Information (Details) - USD ($) |
3 Months Ended | 6 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
Dec. 31, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
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| Income Tax Disclosure [Abstract] | ||||
| Unrecognized tax benefits, interest or penalties recognized | $ 0 | $ 0 | ||
| Corporate tax rate | 21.00% | 34.00% | ||
| Provisional net charge related to TCJA | $ 7,578,000 | |||
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- Definition Tax cuts and jobs act of 2017 change in tax rate provisional net charge. No definition available.
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| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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