Condensed Consolidated Statements of Stockholders’ Equity (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common stock	Additional paid-in capital	Accumulated Other comprehensive loss	Accumulated deficit	Accumulated deficit Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Sep. 30, 2022			56,523
Beginning balance at Sep. 30, 2022	$ 789,385		$ 0	$ 1,619,644	$ (1,843)	$ (828,416)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock units (in shares)			124
Exercise of stock options (in shares)			35
Exercise of stock options	603			603
Issuance of shares associated with a business acquisition (in shares)			1
Repurchases of common stock for income tax withholding (in shares)			(38)
Repurchases of common stock for income tax withholding	(999)			(999)
Stock-based compensation	(2,074)			(2,074)
Other comprehensive income (loss)	1,234				1,234
Net loss	(41,824)					(41,824)
Ending balance (in shares) at Dec. 31, 2022			56,645
Ending balance at Dec. 31, 2022	746,325		$ 0	1,617,174	(609)	(870,240)
Beginning balance (in shares) at Sep. 30, 2022			56,523
Beginning balance at Sep. 30, 2022	$ 789,385		$ 0	1,619,644	(1,843)	(828,416)
Ending balance (in shares) at Sep. 30, 2023	57,557		57,557
Ending balance at Sep. 30, 2023	$ 623,432	$ (148)	$ 0	1,657,222	(756)	(1,033,034)	$ (148)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting standards update	Accounting Standards Update 2016-13 [Member]
Vesting of restricted stock units (in shares)			260
Exercise of stock options (in shares)	58		58
Exercise of stock options	$ 951			951
Repurchases of common stock for income tax withholding (in shares)			(96)
Repurchases of common stock for income tax withholding	(2,424)			(2,424)
Stock-based compensation	11,048			11,048
Other comprehensive income (loss)	191				191
Net loss	$ (43,008)					(43,008)
Ending balance (in shares) at Dec. 31, 2023	57,779		57,779
Ending balance at Dec. 31, 2023	$ 590,042		$ 0	$ 1,666,797	$ (565)	$ (1,076,190)