Public Warrant Tender Offerings - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | |
|---|---|---|
Aug. 31, 2019 |
May 31, 2019 |
|
| Public Warrant Tender Offerings [Line Items] | ||
| Common stock, par value | $ 0.001 | $ 0.001 |
| Public Warrant Tender Offerings [Member] | ||
| Public Warrant Tender Offerings [Line Items] | ||
| Common stock sold at private equity offering | 45,375,923 | |
| Common stock, par value | $ 0.001 | |
| Proceeds from issuance of common shares | $ 11.9 | |
| Placement agent fees and expenses | 1.1 | |
| Noncash inducement interest expense | $ 2.4 | |
| Public Warrant Tender Offerings [Member] | Minimum [Member] | ||
| Public Warrant Tender Offerings [Line Items] | ||
| Purchase price, per share | $ 0.30 | |
| Public Warrant Tender Offerings [Member] | Maximum [Member] | ||
| Public Warrant Tender Offerings [Line Items] | ||
| Purchase price, per share | $ 0.40 |
| X | ||||||||||
- Definition Noncash inducement interest expense. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Face amount or stated value per share of common stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The cash outflow for cost incurred directly with the issuance of an equity security. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The cash inflow from the additional capital contribution to the entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. No definition available.
|
| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|