Derivative Liability - Additional Information (Detail) - USD ($) |
12 Months Ended | ||
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May 31, 2019 |
May 31, 2018 |
May 31, 2017 |
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| Derivative [Line Items] | |||
| Change in fair value of derivative liability | $ 1,666,469 | $ 1,690,935 | $ 2,164,533 |
| Percentage Of Outstanding Common Stock To Be Acquired | 50.00% | ||
| Warrant [Member] | |||
| Derivative [Line Items] | |||
| Change in fair value of derivative liability | $ 900,000 | $ 1,700,000 | $ 2,200,000 |
| Convertible Note [Member] | |||
| Derivative [Line Items] | |||
| Change in fair value of derivative liability | $ 745,000 | ||
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- Definition Percentage Of Outstanding Common Stock To Be Acquired No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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