Provision for Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Income Taxes Disclosure [Line Items] | |||
| Federal Statutory Rate | 34.00% | 34.00% | |
| Deferred tax due to tax reform | $ 10,000 | ||
| Change in valuation allowance | 8,426 | $ 6,616 | |
| Research and expenditure credit carry forward | 490 | ||
| Pre-tax unrecognized excess tax benefits | $ 2,100 | $ 0 | |
| Open tax year | 2014 | ||
| Scenario, Plan [Member] | |||
| Income Taxes Disclosure [Line Items] | |||
| Federal Statutory Rate | 21.00% | ||
| Maximum [Member] | |||
| Income Taxes Disclosure [Line Items] | |||
| Federal Statutory Rate | 35.00% | ||
| Federal [Member] | |||
| Income Taxes Disclosure [Line Items] | |||
| Operating loss carry forward | $ 62,036 | ||
| Research and expenditure credit carry forward | $ 200 | ||
| Research and expenditure credit expiration date | Jan. 01, 2026 | ||
| State [Member] | |||
| Income Taxes Disclosure [Line Items] | |||
| Operating loss carry forward | $ 61,807 | ||
| Research and expenditure credit carry forward | $ 200 | ||
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Income Taxes Disclosure [Line Items] No definition available.
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- Definition Research And Expenditure Credit Carryforwards Expiration Date No definition available.
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- Definition Tax cuts and jobs act of 2017 incomplete accounting revaluation deferred tax asset provisional income tax expense benefit. No definition available.
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