CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Sep. 30, 2021		44,169,000
Beginning balance at Sep. 30, 2021	$ 192,830	$ 44	$ 199,935	$ (140)	$ (943)	$ (6,066)
Treasury Stock, Beginning Balance (in shares) at Sep. 30, 2021				(8,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	35,625	35,000
Exercise of stock options	$ 238		238
Settlement of restricted stock units (in shares)		1,075,000
Settlement of restricted stock units	0	$ 1	(1)
Issuance of common stock under employee stock purchase plan (in shares)		129,000
Issuance of common stock under employee stock purchase plan	1,487		1,487
Acquisition-related shares issued (in shares)		203,000
Acquisition-related shares issued	1,836		1,836
Stock-based compensation expense	13,346		13,346
Repurchase and retirements of common stock (in shares)		(931,000)		8,000
Repurchases and retirements of common stock	(15,176)	$ (1)	(348)	$ 140		(14,967)
Components of comprehensive income (loss)
Net income (loss)	3,694					3,694
Currency translation adjustment	(27,559)				(27,559)
Change in unrealized gain (loss) on investments	283				283
Ending balance (in shares) at Sep. 30, 2022		44,680,000
Ending balance at Sep. 30, 2022	$ 170,979	$ 44	216,493	$ 0	(28,219)	(17,339)
Treasury Stock, Ending Balance (in shares) at Sep. 30, 2022				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	98,952	100,000
Exercise of stock options	$ 727		727
Settlement of restricted stock units (in shares)		689,000
Settlement of restricted stock units	0	$ 2	(2)
Issuance of common stock under employee stock purchase plan (in shares)		122,000
Issuance of common stock under employee stock purchase plan	1,010		1,010
Stock-based compensation expense	10,463		10,463
Components of comprehensive income (loss)
Net income (loss)	8,027					8,027
Currency translation adjustment	13,093				13,093
Change in unrealized gain (loss) on investments	$ 889				889
Ending balance (in shares) at Sep. 30, 2023	45,591,199	45,591,000
Ending balance at Sep. 30, 2023	$ 205,188	$ 46	228,691	$ 0	(14,237)	(9,312)
Treasury Stock, Ending Balance (in shares) at Sep. 30, 2023				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	189,559	274,000
Exercise of stock options	$ 1,889		1,889
Settlement of restricted stock units (in shares)		975,000
Settlement of restricted stock units	0	$ 1	(1)
Issuance of common stock under employee stock purchase plan (in shares)		89,000
Issuance of common stock under employee stock purchase plan	652		652
Acquisition-related shares issued (in shares)		311,000
Acquisition-related shares issued	3,471		3,471
Stock-based compensation expense	12,624		12,624
Repurchase and retirements of common stock (in shares)		(2,241,000)
Repurchases and retirements of common stock	(24,236)	$ (2)				(24,234)
Components of comprehensive income (loss)
Net income (loss)	3,278					3,278
Currency translation adjustment	11,634				11,634
Change in unrealized gain (loss) on investments	$ 301				301
Ending balance (in shares) at Sep. 30, 2024	44,998,939	44,999,000
Ending balance at Sep. 30, 2024	$ 214,801	$ 45	$ 247,326	$ 0	$ (2,302)	$ (30,268)
Treasury Stock, Ending Balance (in shares) at Sep. 30, 2024				0