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Research Funding (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | May 31, 2017 | Feb. 28, 2017
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |  |
Grants receivable | $ 8.6 |  |  |  |  |  | $ 12.2
Grants receivable, current |  |  |  |  |  | $ 5.7 |
Revenue from grants | $ 0.3 | $ 1.9 |  |  | $ 7.9 |  |
Amortization of deferred credit |  |  | $ 0.6 | $ 0.3 | 1.3 |  |
Accrued Liabilities [Member] |  |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |  |
Deferred grant revenue |  |  | 2.6 |  | 2.6 |  |
Other Long-Term Liabilities [Member] |  |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |  |
Deferred grant revenue |  |  | $ 2.8 |  | $ 2.8 |  |

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