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Business Combination - Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 100,309 | $ 0
Agilis |  |
Business Acquisition [Line Items] |  |
Cash and cash equivalents | 328 |
Prepaid expenses and other current assets | 181 |
Fixed assets | 153 |
Other assets | 38 |
Intangible assets - in process research and development (“IPRD”) | 480,000 |
Accounts payable and accrued expenses | (3,828) |
Deferred tax liability | (115,200) |
Fair value of net assets acquired | 361,672 |
Goodwill | 100,309 |
Purchase price | $ 461,981 |

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