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Fair Value Information - Additional Information (Detail) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |  |
Fair value assets transfers from Level 1 to Level 2 | $ 0 |  | $ 0
Fair value assets transfers from Level 2 to Level 1 | 0 |  | 0
Fair value liabilities transfers from Level 1 to Level 2 | 0 |  | 0
Fair value liabilities transfers from Level 2 to Level 1 | 0 |  | $ 0
Fair Value on Non-Recurring Basis [Member] |  |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |  |
Total assets | $ 0 | $ 74,000 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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