Equity - Summary of Unvested Shares of Restricted Common Stock (Parenthetical) (Detail) - Restricted stock and restricted stock units [Member] - 2013 Plan [Member] |
9 Months Ended |
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Sep. 30, 2017 | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Stock-based award vesting minimum percentage | 0.00% |
| Stock-based award vesting maximum percentage | 200.00% |
| Number of units vested percentage | 100.00% |
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- Definition Represents the maximum vesting percentage for share based performance awards. No definition available.
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- Definition Represents the minimum vesting percentage for share based performance awards. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Percentage of vesting of share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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