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The amount of research and development expense payable on achieving milestone targets.

+ References

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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The amount of consideration recognized during the period for the milestone or milestones.

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License, Clinical Trial and Sponsored Research Agreements (Details Textual) - USD ($)	1 Months Ended	9 Months Ended
	Aug. 02, 2018	Sep. 30, 2018	Sep. 30, 2017	Mar. 17, 2018	Jan. 03, 2018
Payments to Acquire Intangible Assets		$ 1,075,000	$ 2,375,000
Revenue Recognition, Milestone Method, Revenue Recognized	$ 13,500,000
License [Member]
Payments to Acquire Intangible Assets	1,000,000
Annual Maintenance Fee	$ 100,000
City Of Hope [Member]
Research And Development Expense, Sponsored Research Payment					$ 900,000
City Of Hope [Member] \| Patent and Know-how Rights [Member]
Research And Development Expense, Sponsored Research Payment					$ 75,000
Fred Hutchinson Cancer Research Center [Member]
Research And Development Expense, Sponsored Research Payment				$ 600,000