Commitments and Contingencies (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	May 30, 2018	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2022
Takeda License Agreement
Supply Commitment [Line Items]
Royalty expense		$ 3.8	$ 1.5	$ 6.9	$ 2.4
Royalties payable		$ 3.8		$ 3.8		$ 2.5
Takeda Commercial Supply Agreement
Supply Commitment [Line Items]
Agreement term after first commercial sale				10 years
Agreement term	5 years
Automatic renewal term				1 year
Termination notice term				12 months
Termination notice term, uncured material breach				90 days
Termination notice term, open purchase orders filed				180 days