Shareholders' Deficit (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Jun. 04, 2019 USD ($) $ / shares shares	Mar. 31, 2021 $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2022 $ / shares shares	Apr. 30, 2018 USD ($)	Feb. 02, 2016 day
Subsidiary, Sale of Stock [Line Items]
Number of classes of stock | day						1
Common shares authorized (in shares)		564,111,242		564,111,242
Common shares par value (in USD per share) | $ / shares		$ 0.000017727		$ 0.000017727
Number of securities exercisable by warrant (in shares)		23,910		49,800
Exercise price of warrants (in USD per share) | $ / shares		$ 18.82		$ 15.06
Public Offering
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)	17,424,243
Price of shares (in USD per share) | $ / shares	$ 8.25
Net proceeds from sale of shares | $	$ 134.5
Cowen and Company, LLC | Private Placement
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)		0	106,494
Price of shares (in USD per share) | $ / shares			$ 24.65
Net proceeds from sale of shares | $			$ 2.5
Aggregate offering price | $					$ 100.0
Roivant | Public Offering
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)	2,424,242
Net proceeds from sale of shares | $	$ 20.0