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Basis of Presentation - Additional Information (Detail) | Nov. 09, 2016 shares | Sep. 30, 2017 shares | Dec. 31, 2016 shares
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Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |
Common stock split ratio | 2,200 |  |
Common stock, shares authorized | 350,000,000 | 350,000,000 | 350,000,000
Effective date of stock split | Nov. 09, 2016 |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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