Condensed Consolidated Statements of Stockholders’ Equity (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated Other comprehensive income or (loss)	Accumulated deficit
Beginning balance (in shares) at Sep. 30, 2021		49,499
Beginning balance at Sep. 30, 2021	$ 580,821	$ 0	$ 1,190,828	$ 546	$ (610,553)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in public offering, net of underwriting discounts and commissions and offering expenses (in shares)		5,227
Issuance of common stock in public offering, net of underwriting discounts and commissions and offering expenses	269,824		269,824
Vesting of restricted stock units (in shares)		263
Exercise of stock options (in shares)		417
Exercise of stock options	4,701		4,701
Issuance of shares under the employee stock purchase plan (in shares)		50
Issuance of shares under the employee stock purchase plan	2,394		2,394
Repurchases of common stock for income tax withholding (in shares)		(101)
Repurchases of common stock for income tax withholding	(6,130)		(6,130)
Issuance of shares from business acquisition (in shares)		989
Issuance of shares from business acquisition	77,122		77,122
Stock-based compensation	60,616		60,616
Other comprehensive income (loss)	(1,923)			(1,923)
Net loss	(166,748)				(166,748)
Ending balance (in shares) at Jun. 30, 2022		56,344
Ending balance at Jun. 30, 2022	820,677	$ 0	1,599,355	(1,377)	(777,301)
Beginning balance (in shares) at Mar. 31, 2022		56,234
Beginning balance at Mar. 31, 2022	863,361	$ 0	1,580,620	(475)	(716,784)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in public offering, net of underwriting discounts and commissions and offering expenses	6		6
Vesting of restricted stock units (in shares)		100
Exercise of stock options (in shares)		48
Exercise of stock options	766		766
Repurchases of common stock for income tax withholding (in shares)		(38)
Repurchases of common stock for income tax withholding	(2,080)		(2,080)
Stock-based compensation	20,043		20,043
Other comprehensive income (loss)	(902)			(902)
Net loss	(60,517)				(60,517)
Ending balance (in shares) at Jun. 30, 2022		56,344
Ending balance at Jun. 30, 2022	820,677	$ 0	1,599,355	(1,377)	(777,301)
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)		504
Exercise of stock options (in shares)	102	102
Exercise of stock options	$ 1,195		1,195
Issuance of shares under the employee stock purchase plan (in shares)		132
Issuance of shares under the employee stock purchase plan	2,536		2,536
Repurchases of common stock for income tax withholding (in shares)		(171)
Repurchases of common stock for income tax withholding	(3,275)		(3,275)
Issuance of shares from business acquisition (in shares)		277
Issuance of shares from business acquisition	5,860		5,860
Stock-based compensation	19,016		19,016
Other comprehensive income (loss)	1,208			1,208
Net loss	(158,375)				(158,375)
Ending balance (in shares) at Jun. 30, 2023		57,367
Ending balance at Jun. 30, 2023	657,550	$ 0	1,644,976	(635)	(986,791)
Beginning balance (in shares) at Mar. 31, 2023		57,105
Beginning balance at Mar. 31, 2023	703,932	$ 0	1,633,217	111	(929,396)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock units (in shares)		182
Exercise of stock options (in shares)		45
Exercise of stock options	342		342
Repurchases of common stock for income tax withholding (in shares)		(70)
Repurchases of common stock for income tax withholding	(1,014)		(1,014)
Issuance of shares from business acquisition (in shares)		105
Issuance of shares from business acquisition	1,767		1,767
Stock-based compensation	10,664		10,664
Other comprehensive income (loss)	(746)			(746)
Net loss	(57,395)				(57,395)
Ending balance (in shares) at Jun. 30, 2023		57,367
Ending balance at Jun. 30, 2023	$ 657,550	$ 0	$ 1,644,976	$ (635)	$ (986,791)