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License Agreements, Clinical Research Support Agreements and Sponsored Research Agreements (Details) - USD ($) $ in Thousands | 10 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Research and development - licenses acquired | $ 2,337 | $ 2,337 | $ 12,433 | $ 6,079
CART [Member] |  |  |  |
Research and development - licenses acquired |  | 2,147 | 0 | 1,683
IL13Ra2 [Member] |  |  |  |
Research and development - licenses acquired |  | 0 | 500 | 0
IV/ICV [Member] |  |  |  |
Research and development - licenses acquired |  | 0 | 125 | 0
PSCA [Member] |  |  |  |
Research and development - licenses acquired |  | 0 | 300 | 0
HER2 [Member] |  |  |  |
Research and development - licenses acquired |  | 0 | 600 | 0
CS1 [Member] |  |  |  |
Research and development - licenses acquired |  | 0 | 600 | 0
CRISPR [Member] [Member] |  |  |  |
Research and development - licenses acquired |  | 0 | 250 | 0
Fortress PIK Dividend [Member] |  |  |  |
Research and development - licenses acquired |  | 190 | 9,558 | 4,396
UCLA [Member] |  |  |  |
Research and development - licenses acquired |  | 0 | 200 | 0
Fred Hutch CD20 [Member] |  |  |  |
Research and development - licenses acquired |  | $ 0 | $ 300 | $ 0

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