Activity Related to Notes (Detail) - USD ($) |
12 Months Ended | |||
|---|---|---|---|---|
Jan. 31, 2018 |
May 31, 2019 |
May 31, 2018 |
May 31, 2017 |
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| Debt Instrument [Line Items] | ||||
| Face amount of Note | $ 4,654,568 | |||
| Registered direct offering | (3,586,035) | $ 0 | ||
| Repayment of principal and interest on convertible note | 0 | (259,157) | $ 0 | |
| Short-Term Convertible Notes | ||||
| Debt Instrument [Line Items] | ||||
| Face amount of Note | 6,038,500 | |||
| Unamortized discount | 0 | |||
| Registered direct offering | (5,788,500) | |||
| Repayment of principal and interest on convertible note | $ (259,000) | (250,000) | ||
| Carrying value of Note | 0 | |||
| 2019 Short Term Convertible Notes | ||||
| Debt Instrument [Line Items] | ||||
| Face amount of Note | 5,460,000 | 0 | ||
| Unamortized discount | (1,469,625) | 0 | ||
| Unamortized issuance costs | (404,340) | 0 | ||
| Carrying value of Note | $ 3,586,035 | $ 0 | ||
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- Definition Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 Amount, after accumulated amortization, of debt discount. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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