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Research Funding (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | May 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 28, 2017
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Grants receivable | $ 8.6 |  |  |  |  | $ 12.2
Funding of grant award |  |  | $ 5.7 |  |  |
Milestone payment received on grant award |  | $ 1.9 |  |  |  |
Progress payment received on grant award | $ 0.3 |  |  |  |  |
Amortization of accrued grant funding to offset expense |  |  |  | $ 2.6 | $ 1.3 |
Accrued Liabilities |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Accrued grant funding |  |  |  | 2.6 |  |
Other Long-term Liabilities |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Accrued grant funding |  |  |  | $ 1.5 |  |

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- Definition Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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