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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 1,914 | $ 1,914 | $ 1,914
Impairment loss |  | 9,550 | 0
Intangible assets | 8,500 | 8,500 | 17,600
GALE-401 |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets | 0 | 0 | 9,100
IPR&D | GALE-401 |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment loss | 9,600 |  |
Intangible assets |  |  | $ 9,100
Upfront milestone payments, deposits and other assets | 500 | $ 500 |
Income tax expense (benefit) | $ (1,400) |  |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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