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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | Intangible assets consist of IPR&D acquired as part of the Merger. IPR&D assets represent research and development assets that have not yet reached commercialization. The Company's intangible assets consist of the following:
| Year Ended December 31,
| 2018 |  | 2017
NPS | $ | 5,700 |  |  | $ | 5,700 |
GALE-401 | — |  |  | 9,100 |
GALE-301 and GALE-302 | 2,800 |  |  | 2,800 |
| $ | 8,500 |  |  | $ | 17,600 |

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