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Equity - Class A Common Shares Reserved for Future Issuance (Detail) | Dec. 31, 2017 shares
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Class of Stock [Line Items] |
Total shares reserved for future issuance | 6,836,348
Stock Option [Member] |
Class of Stock [Line Items] |
Total shares reserved for future issuance | 567,100
Restricted Stock Units [Member] |
Class of Stock [Line Items] |
Total shares reserved for future issuance | 869,248
Class B Common Stock Converted Into Class A Common Stock [Member] |
Class of Stock [Line Items] |
Total shares reserved for future issuance | 5,400,000

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- Definition Aggregate number of common shares reserved for future issuance. + 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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