Fair Value of Financial Instruments - Summary of Activity for Liabilities Measured at Fair Value using Level 3 Significant Unobservable Inputs (Detail) - USD ($)	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Change in fair value of warrant liability	$ 3,915,393	$ (3,644,601)
Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance, March 31, 2020	3,639,000
Ending balance, March 2021	1,931,921	$ 3,639,000
Level 3 [Member] \| Before May 2020 Warrant Exchange [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Change in fair value of warrant liability	3,661,000
Level 3 [Member] \| May 20, 2020 Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Less: Fair value of warrants	(7,300,000)
Level 3 [Member] \| May 20, 2020 Warrant [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Add: Fair value of warrants	1,677,528
Level 3 [Member] \| May 20, 2020 to March 31, 2021 Warrant [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Change in fair value of warrant liability	$ 254,393

Amount of expense (income) related to adjustment to fair value of warrant liability.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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