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The company - (Detail) - USD ($) $ in Thousands | 104 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020
Accumulated deficit | $ (610,553) | $ (458,455)
Subsequent Public Offering [Member] |  |
Proceeds from the issuance of equity securities | 1,063,900 |
Proceeds from issuance of debt | $ 13,800 |

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