Stockholders' equity - Summary of share-based compensation expense (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
|
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 |