CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning balance (in shares) at Sep. 30, 2020		29,550,000
Shares of common stock
Stock-based compensation (in shares)		572,000
Exercised (in shares)		15,000
Issuance of common stock - ESPP (in shares)		192,000
Sale of common stock (in shares)		6,655,000
Ending balance (in shares) at Sep. 30, 2021	36,984,000	36,984,000
Balance, beginning of period at Sep. 30, 2020		$ 744,361	$ (47,721)	$ 918	$ (623,409)
Shares of common stock
Stock-based compensation		4,180
Stock option exercises		77
Tax withholding paid on behalf of employees for stock-based awards		(260)
Issuance of common stock - ESPP		767
Sale of common stock, net of offering costs		33,141
Translation adjustment	$ (231)			(231)
Pension income	0
Net (loss) income	25,643				25,643
Balance, end of period at Sep. 30, 2021	$ 137,466	$ 782,266	(47,721)	687	(597,766)
Shares of common stock
Stock-based compensation (in shares)		601,000
Exercised (in shares)	5,725	6,000
Issuance of common stock - ESPP (in shares)		0
Sale of common stock (in shares)		0
Ending balance (in shares) at Sep. 30, 2022	37,591,000	37,591,000
Shares of common stock
Stock-based compensation		$ 5,374
Stock option exercises		29
Tax withholding paid on behalf of employees for stock-based awards		(322)
Issuance of common stock - ESPP		0
Sale of common stock, net of offering costs		0
Translation adjustment	$ 173			173
Pension income	441
Net (loss) income	(24,333)				(24,333)
Balance, end of period at Sep. 30, 2022	$ 118,828	$ 787,347	$ (47,721)	$ 1,301	$ (622,099)