Schedule of Changes in Estimated Fair Value of Warrant Liability (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
| Fair value measurements Significant unobservable inputs [Line Items] | |||
| Beginning balance | $ 17,613 | $ 17,600 | |
| Change in estimated fair value of liability classified warrants | 22,870 | (27,632) | $ 9,705 |
| Ending balance | 40,483 | 17,613 | 17,600 |
| Fair Value, Measurements, Recurring [Member] | Level 3 | |||
| Fair value measurements Significant unobservable inputs [Line Items] | |||
| Beginning balance | 17,613 | 46,313 | |
| Reclassification of derivative liability to equity upon exercise of warrants | (1,068) | ||
| Change in estimated fair value of liability classified warrants | 22,870 | (27,632) | |
| Ending balance | $ 40,483 | $ 17,613 | $ 46,313 |