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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |
Income tax expense (benefit) | $ 3,000 |
Effective tax rate | (0.85%) |
Federal and state Net Operating Losses | $ 147,000,000 |
Year of expiration of net operating loss carryforward expiration year | 2027 |
Accruals related to uncertainties tax positions | $ 0 | $ 0
Tax year remain subject to examination | 2015 2016 2017 2018 |

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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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