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Research Funding (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 02, 2017 | Dec. 31, 2017 | May 31, 2017 | Dec. 31, 2017 | Feb. 28, 2017 | Feb. 23, 2017
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Grants receivable |  |  |  |  | $ 12.2 | $ 12.2
Grant payments received | $ 1.9 | $ 1.9 | $ 5.7 |  |  |
Grant revenue recognized |  |  |  | $ 1.3 |  |
Accrued Liabilities |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Deferred grant revenue |  | 2.4 |  | 2.4 |  |
Other Long-term Liabilities |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Deferred grant revenue |  | $ 3.9 |  | $ 3.9 |  |

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