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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
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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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