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Fair Value Measurements - Schedule of Fair Value of Unobservable Input Related To Options to Acquire Under Sumitomo Transaction Agreement (Detail) | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Measurement Input, Expected Term [Member] | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Time to expiration (in years) | 3 years 7 months 2 days | 5 months 26 days
Measurement Input, Expected Term [Member] | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Time to expiration (in years) | 3 years 7 months 2 days | 4 years 7 months 2 days
Risk-free rate | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment | 0.0052 | 0.0015
Risk-free rate | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment | 0.0052 | 0.0035
Measurement Input, Option Volatility [Member] | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment | 0.890 | 0.910
Measurement Input, Option Volatility [Member] | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment | 0.950 | 1.100

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