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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |
Valuation allowance | $ 5,907 |
Operating loss carryforwards, expiration date | 2037 |
Tax benefits recorded to additional paid-in capital because of the exercise of stock options | $ 100 | $ 800
Federal [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 26,700 |
State [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | $ 1,300 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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