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Share-based Compensation Expense - Share-based Compensation Allocation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Total share-based compensation | $ 2,864 | $ 3,337 | $ 7,948 | $ 8,599
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Total share-based compensation | 1,525 | 1,831 | 4,982 | 4,802
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Total share-based compensation | 1,335 | 1,506 | 2,947 | 3,797
Capitalized |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Total share-based compensation | $ 4 | $ 0 | $ 19 | $ 0

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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