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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

X

- Definition

The amount of purchased research and development assets that are acquired in a business combination have no alternative future use and are therefore written off in the period of acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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