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Basis of Presentation and Summary of Significant Accounting Policies - Revenue by Source (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 90,043	$ 27,995	$ 146,200	$ 57,264
Material Sales: Captisol
Disaggregation of Revenue [Line Items]
Total revenue	7,612	5,550	12,003	6,672
License fees, milestones and other
Disaggregation of Revenue [Line Items]
Total revenue	51,035	8,234	81,981	12,151
License Fees
Disaggregation of Revenue [Line Items]
Total revenue	47,981	666	74,936	3,538
Milestone
Disaggregation of Revenue [Line Items]
Total revenue	1,919	4,497	4,744	5,505
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,135	$ 3,071	$ 2,301	$ 3,108

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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