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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
	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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+ References

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X

- Definition

Value of input used to measure alternative investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

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+ References

No definition available.

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