CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Accumulated other comprehensive income, beginning and end of period	Accumulated deficit
Beginning balance (in shares) at Sep. 30, 2022		37,591
Shares of common stock
Stock-based compensation (in shares)		277
Ending balance (in shares) at Dec. 31, 2022		37,868
Balance, beginning of period at Sep. 30, 2022		$ 787,347	$ (47,721)	$ 441	$ (622,099)
Shares of common stock
Stock-based compensation		1,734
Stock issuance costs		0
Tax withholding paid on behalf of employees for stock-based awards		(1)
Net loss	$ (11,693)				(11,693)
Balance, end of period at Dec. 31, 2022	$ 108,008	$ 789,080	(47,721)		(633,792)
Beginning balance (in shares) at Sep. 30, 2023	77,108	77,108
Shares of common stock
Stock-based compensation (in shares)		194
Ending balance (in shares) at Dec. 31, 2023	77,302	77,302
Balance, beginning of period at Sep. 30, 2023		$ 825,119	(47,721)	$ 350	(697,458)
Shares of common stock
Stock-based compensation		848
Stock issuance costs		(18)
Tax withholding paid on behalf of employees for stock-based awards		(1)
Net loss	$ (5,679)
Balance, end of period at Dec. 31, 2023	$ 75,440	$ 825,948	$ (47,721)		$ (703,137)