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Share Based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Total share-based compensation | $ 3,393 | $ 30,386 | $ 6,765 | $ 3,153
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Total share-based compensation | 1,906 | 17,761 | 3,116 | 1,145
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Total share-based compensation | 1,487 | 12,451 | 3,649 | 2,008
Capitalized to fixed assets |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Total share-based compensation | $ 0 | $ 174 | $ 0 | $ 0

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