Stockholders' equity - Summary of share-based compensation expense (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
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Sep. 30, 2020 |
Sep. 30, 2019 |
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| Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] | ||
| Share-based compensation expense | $ 38 | $ 55 |
| Research and development [Member] | ||
| Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] | ||
| Share-based compensation expense | 9 | (17) |
| General and administrative [Member] | ||
| Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] | ||
| Share-based compensation expense | $ 29 | $ 72 |
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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