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License and Collaboration Agreements - Additional Information (Details1) - Alexion Agreements - Eidos - Common Stock $ / shares in Units, $ in Millions	Sep. 30, 2019 USD ($) $ / shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Shares issued, price per share | $ / shares	$ 44.95
Excess of purchase price over the value of common stock shares | $	$ 1.7
The Nasdaq Global Select Market
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Shares issued, price per share | $ / shares	$ 41.91
Excess of purchase price over the value of common stock shares | $	$ 1.7

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

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