Activity Related to Notes (Detail) - USD ($) |
12 Months Ended | |
|---|---|---|
May 31, 2017 |
May 31, 2016 |
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| 2013 Convertible Notes | ||
| Debt Instrument [Line Items] | ||
| Face amount of Notes | $ 0 | $ 50,000 |
| Unamortized discount | 0 | |
| Conversions | 0 | (50,000) |
| Total carrying value of Notes | 0 | |
| 2015 Short-Term Convertible Notes | ||
| Debt Instrument [Line Items] | ||
| Face amount of Notes | 0 | 3,981,050 |
| Unamortized discount | 0 | |
| Conversions | 0 | (525,000) |
| Payments upon maturity | 0 | (762,250) |
| Total carrying value of Notes | 0 | |
| 2015 Short-Term Convertible Notes | Tender Offer | ||
| Debt Instrument [Line Items] | ||
| Conversions | $ 0 | $ (2,693,800) |
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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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/presentationRef
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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://www.xbrl.org/2003/role/presentationRef
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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/presentationRef
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- Definition The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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