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License, Clinical Trial and Sponsored Research Agreements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Research and development - licenses acquired | $ 200 | $ 0 | $ 650 | $ 75
Sponsored Research And Clinical Trial Agreements [Member] |  |  |  |
Research and development - licenses acquired | 1,670 | 1,290 | 3,265 | 2,680
City of Hope | Sponsored Research And Clinical Trial Agreements [Member] |  |  |  |
Research and development - licenses acquired | 500 | 500 | 1,000 | 1,000
City of Hope - CD 123 |  |  |  |
Research and development - licenses acquired | 0 | 0 | 250 | 0
City of Hope - CD 123 | Sponsored Research And Clinical Trial Agreements [Member] |  |  |  |
Research and development - licenses acquired | 456 | 114 | 759 | 264
City of Hope - IL13Ra2 | Sponsored Research And Clinical Trial Agreements [Member] |  |  |  |
Research and development - licenses acquired | 225 | 143 | 567 | 503
City Of Hope - CS1 |  |  |  |
Research and development - licenses acquired | 200 | 0 | 200 | 0
City of Hope - Manufacturing |  |  |  |
Research and development - licenses acquired | 0 | 0 | 0 | 75
City of Hope - Manufacturing | Sponsored Research And Clinical Trial Agreements [Member] |  |  |  |
Research and development - licenses acquired | 115 | 115 | 229 | 229
Nationwide Children's Hospital - C134 |  |  |  |
Research and development - licenses acquired | 0 | 0 | 200 | 0
Fred Hutch - CD20 | Sponsored Research And Clinical Trial Agreements [Member] |  |  |  |
Research and development - licenses acquired | 374 | 418 | 641 | 684
BIDMC - CRISPR | Sponsored Research And Clinical Trial Agreements [Member] |  |  |  |
Research and development - licenses acquired | $ 0 | $ 0 | $ 69 | $ 0

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