Condensed Consolidated Statements of Stockholders’ Equity (unaudited) - USD ($) $ 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, 2023			57,557,000
Beginning balance at Sep. 30, 2023	$ 623,432	$ (148)	$ 0	$ 1,657,222	$ (756)	$ (1,033,034)	$ (148)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock units (in shares)			489,000
Exercise of stock options (in shares)			127,000
Exercise of stock options	2,268			2,268
Issuance of shares under the employee stock purchase plan (in shares)			124,000
Issuance of shares under the employee stock purchase plan	2,047			2,047
Repurchases of common stock for income tax withholding (in shares)			(135,000)
Repurchases of common stock for income tax withholding	(3,960)			(3,960)
Stock-based compensation	24,896			24,896
Other comprehensive income (loss)	96				96
Net loss	(88,500)					(88,500)
Ending balance (in shares) at Mar. 31, 2024			58,162,000
Ending balance at Mar. 31, 2024	560,131		$ 0	1,682,473	(660)	(1,121,682)
Beginning balance (in shares) at Dec. 31, 2023			57,779,000
Beginning balance at Dec. 31, 2023	590,042		$ 0	1,666,797	(565)	(1,076,190)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock units (in shares)			229,000
Exercise of stock options (in shares)			69,000
Exercise of stock options	1,317			1,317
Issuance of shares under the employee stock purchase plan (in shares)			124,000
Issuance of shares under the employee stock purchase plan	2,047			2,047
Repurchases of common stock for income tax withholding (in shares)			(39,000)
Repurchases of common stock for income tax withholding	(1,535)			(1,535)
Stock-based compensation	13,847			13,847
Other comprehensive income (loss)	(95)				(95)
Net loss	(45,492)					(45,492)
Ending balance (in shares) at Mar. 31, 2024			58,162,000
Ending balance at Mar. 31, 2024	$ 560,131		$ 0	1,682,473	(660)	(1,121,682)
Beginning balance (in shares) at Sep. 30, 2024	58,877,000		58,877,000
Beginning balance at Sep. 30, 2024	$ 472,689		$ 0	1,715,119	(522)	(1,241,908)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted common stock canceled (in shares)			(137,000)
Vesting of restricted stock units (in shares)			811,000
Exercise of stock options (in shares)	238,000		241,000
Exercise of stock options	$ 3,722			3,722
Issuance of shares under the employee stock purchase plan (in shares)			65,000
Issuance of shares under the employee stock purchase plan	2,429			2,429
Repurchases of common stock for income tax withholding	(11)			(11)
Stock-based compensation	32,341			32,341
Other comprehensive income (loss)	(140)				(140)
Net loss	$ (70,922)					(70,922)
Ending balance (in shares) at Mar. 31, 2025	59,857,000		59,857,000
Ending balance at Mar. 31, 2025	$ 440,108		$ 0	1,753,600	(662)	(1,312,830)
Beginning balance (in shares) at Dec. 31, 2024			59,582,000
Beginning balance at Dec. 31, 2024	455,941		$ 0	1,730,092	(649)	(1,273,502)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted common stock canceled (in shares)			(137,000)
Vesting of restricted stock units (in shares)			275,000
Exercise of stock options (in shares)			72,000
Exercise of stock options	771			771
Issuance of shares under the employee stock purchase plan (in shares)			65,000
Issuance of shares under the employee stock purchase plan	2,429			2,429
Repurchases of common stock for income tax withholding	(4)			(4)
Stock-based compensation	20,312			20,312
Other comprehensive income (loss)	(13)				(13)
Net loss	$ (39,328)					(39,328)
Ending balance (in shares) at Mar. 31, 2025	59,857,000		59,857,000
Ending balance at Mar. 31, 2025	$ 440,108		$ 0	$ 1,753,600	$ (662)	$ (1,312,830)