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, 2015		25,676,000
Beginning balance at Sep. 30, 2015	$ 135,442	$ 762,003	$ (47,721)	$ 847	$ (579,687)
Net income	8,266				8,266
Translation adjustment	(268)			(268)
Stock-based compensation (in shares)		284,000
Stock-based compensation	1,868	$ 1,868
Stock option exercises (in shares)		45,000
Stock option exercises	225	$ 225
Special dividend paid	(39,214)	$ (39,214)
Issuance of common stock - ESPP (in shares)		193,000
Issuance of common stock - ESPP	735	$ 735
Issuance of common stock - Board of Directors (in shares)		46,000
Issuance of common stock - Board of Directors	263	$ 263
Ending balance (in shares) at Sep. 30, 2016		26,244,000
Ending balance at Sep. 30, 2016	107,317	$ 725,666	(47,721)	579	(571,207)
Cumulative adjustment for adoption of accounting standard		$ (214)			214
Net income	8,235				8,235
Translation adjustment	(18)			(18)
Stock-based compensation (in shares)		432,000
Stock-based compensation	3,602	$ 3,602
Stock option exercises (in shares)		158,000
Stock option exercises	534	$ 534
Issuance of common stock - ESPP (in shares)		133,000
Issuance of common stock - ESPP	773	$ 773
Issuance of common stock - Board of Directors (in shares)		61,000
Issuance of common stock - Board of Directors	$ 331	$ 331
Ending balance (in shares) at Sep. 30, 2017	27,028,000	27,028,000
Ending balance at Sep. 30, 2017	$ 120,774	$ 730,906	(47,721)	561	(562,972)
Net income	(17,453)				(17,453)
Translation adjustment	324			324
Stock-based compensation (in shares)		372,000
Stock-based compensation	$ 3,648	$ 3,648
Stock option exercises (in shares)	6,392	6,000
Stock option exercises	$ 28	$ 28
Issuance of common stock - ESPP (in shares)		171,000
Issuance of common stock - ESPP	741	$ 741
Tax withholding paid on behalf of employees for stock-based awards	$ (1,257)	$ (1,257)
Ending balance (in shares) at Sep. 30, 2018	27,577,000	27,577,000
Ending balance at Sep. 30, 2018	$ 106,805	$ 734,066	$ (47,721)	$ 885	$ (580,425)