Subsequent events	12 Months Ended
Mar. 31, 2026
Subsequent Events [Abstract]
Subsequent events	Subsequent events On April 10, 2026 the Company received a CRL from the FDA for the BLA for RP1 in combination with nivolumab for the treatment of advanced melanoma. As a result of the CRL, the Company announced its plan for a restructuring, which included a reduction of its workforce by approximately 55%. As a result of this reduction in force, the Company estimates that it will record a charge in the range of $9.8 million to $10.3 million during the three months ended June 30, 2026, related to employee termination benefits, including severance, all of which is anticipated to result in cash expenditures. Communication has been made to all impacted employees under this restructuring plan. The Company expects the reduction in force to be substantially complete by the end of the first quarter of fiscal 2027.

Subsequent events

12 Months Ended

Mar. 31, 2026

On April 10, 2026 the Company received a CRL from the FDA for the BLA for RP1 in combination with nivolumab for the treatment of advanced melanoma. As a result of the CRL, the Company announced its plan for a restructuring, which included a reduction of its workforce by approximately 55%. As a result of this reduction in force, the Company estimates that it will record a charge in the range of $9.8 million to $10.3 million during the three months ended June 30, 2026, related to employee termination benefits, including severance, all of which is anticipated to result in cash expenditures. Communication has been made to all impacted employees under this restructuring plan. The Company expects the reduction in force to be substantially complete by the end of the first quarter of fiscal 2027.