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Related Party Disclosures (Tables)
 12 Months Ended
Mar. 31, 2021
Related Party Transactions [Abstract]  
Schedule of Maturities of Long-term Debt
Annual maturities of amounts outstanding as of March 31, 2021 under the Sumitomo Dainippon Pharma Loan Agreement are as follows (in thousands):
Years Ended March 31,
2022$— 
2023— 
2024— 
2025358,700 
Total$358,700