Liability Related to Sale of Future Royalties - Additional Information (Details) $ / shares in Units, $ in Millions	Jun. 24, 2020 USD ($) Account $ / shares shares
Liability Related To Sale Of Future Royalties [Line Items]
Number of units of accounting related to consideration received | Account	2
Liability related to sale of future royalties, net	$ 294.5
Transaction cost of liability related to sale of future royalties	0.8
Transaction consideration allocated to common shares	$ 55.5
Effective interest rate including transaction costs	13.80%
Development Agreement
Liability Related To Sale Of Future Royalties [Line Items]
Proceeds from royalty agreement	$ 300.0
Purchase Agreement
Liability Related To Sale Of Future Royalties [Line Items]
Proceeds from issuance of common stock, net	50.0
Purchase Agreement | Common Stock A | BXLS
Liability Related To Sale Of Future Royalties [Line Items]
Proceeds from issuance of common stock, net	$ 50.0
Issuance of common stock | shares	340,793
Shares issued, price per share | $ / shares	$ 146.72