Income Taxes - Additional Information (Detail) - USD ($) |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
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| Income Taxes [Line Items] | |||||
| U.S. federal statutory tax rate | 21.00% | ||||
| Percentage of TCJA limitations on net operating loss carryforwards to taxable income | 80.00% | ||||
| Maximum | |||||
| Income Taxes [Line Items] | |||||
| U.S. federal statutory tax rate | 35.00% | ||||
| Federal | |||||
| Income Taxes [Line Items] | |||||
| Net operating loss carryforwards | $ 60,600,000 | ||||
| Net operating loss carryforwards expiration period | carried forward for 20 years and are expected to be available to fully offset taxable income earned in future tax years. | ||||
| Current income tax expense benefit | $ 0 | $ 0 | $ 0 | $ 0 | |
| Deferred income tax expense benefit | 0 | $ 0 | 0 | $ 0 | |
| Federal and State | |||||
| Income Taxes [Line Items] | |||||
| Net operating loss carryforwards | $ 60,600,000 | $ 60,600,000 | |||
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- Definition Income Taxes [Line Items] No definition available.
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- Definition Tax Cuts and Jobs Act of 2017, change in tax rate federal operating loss carryforwards. No definition available.
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- Definition Tax Cuts and Jobs Act of 2017 change in tax rate, net operating loss carryforwards expiration period description. No definition available.
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- Definition Tax cuts and jobs act of 2017 percentage of limitations on net operating loss carryforwards to taxable income. No definition available.
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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- 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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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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