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Share-Based Compensation Expense for Stock Awards (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation | $ 2,324 | $ 2,609 | $ 4,863 | $ 5,551
Research and development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation | 658 | 1,160 | 1,280 | 2,289
General and administrative |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation | $ 1,666 | $ 1,449 | $ 3,583 | $ 3,262

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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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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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