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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