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Summary of Option Activity (Parenthetical) (Detail) - Employee Stock Option | Sep. 30, 2019
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Awards Granted to Non-Executive Level Employees |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Estimated forfeiture rates | 8.00%
Awards Granted to Executive Level Employees |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Estimated forfeiture rates | 3.00%

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- Definition Percentage of shares subject to forfeiture. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |