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License Agreements (Details) £ in Thousands, $ in Thousands | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 GBP (£) shares | Sep. 30, 2014 USD ($) shares | Sep. 30, 2018 USD ($) | Sep. 30, 2018 GBP (£) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($)
Schedule Of License Agreements [Line Items] |  |  |  |  |  |
Accrued license fees payable | $ |  |  | $ 653 |  | $ 500 | $ 0
UCLB |  |  |  |  |  |
Schedule Of License Agreements [Line Items] |  |  |  |  |  |
Shares issued (shares) | shares | 313,971 | 1,497,643 |  |  |  |
Payment of upfront fees | £ 1,500 | $ 300 |  |  |  |
Annual license fee payments |  |  |  | £ 30 |  |
UCLB | Regulatory Approval |  |  |  |  |  |
Schedule Of License Agreements [Line Items] |  |  |  |  |  |
Conditional payment, regulatory approval |  |  |  | 35,500 |  |
UCLB | Net Sales Levels |  |  |  |  |  |
Schedule Of License Agreements [Line Items] |  |  |  |  |  |
Conditional payment, regulatory approval |  |  |  | 51,000 |  |
UCLB | Product Sales |  |  |  |  |  |
Schedule Of License Agreements [Line Items] |  |  |  |  |  |
Conditional payment, regulatory approval |  |  |  | 18,000 |  |
UCLB | Product Sales | Minimum |  |  |  |  |  |
Schedule Of License Agreements [Line Items] |  |  |  |  |  |
Conditional payment, regulatory approval |  |  |  | 1,000 |  |
UCLB | Product Sales | Maximum |  |  |  |  |  |
Schedule Of License Agreements [Line Items] |  |  |  |  |  |
Conditional payment, regulatory approval |  |  |  | £ 18,500 |  |

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