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Organization and Description of Business (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated deficit	$ 1,312,830		$ 1,312,830		$ 1,241,908
Net loss attributable to common stockholders	39,328	$ 45,492	70,922	$ 88,500
Cash and cash equivalents	210,437		210,437		226,316
Short-term investments	$ 46,710		$ 46,710		$ 50,083

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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