CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenue	$ 124,126	$ 158,444
Cost of revenue	94,408	96,956
Gross profit	29,718	61,488
Operating expense:
Selling, general, and administrative	33,710	24,544
Research and development	18,536	17,448
Severance	1,353	0
(Gain) loss on sale of assets	(2,685)	515
Impairment charge	2,956	0
Total operating expense	53,870	42,507
Operating (loss) income	(24,152)	18,981
Other (expense) income:
Gain on extinguishment of debt	0	6,561
Interest income (expense), net	(139)	466
Foreign exchange gain (loss)	(352)	207
Pension income	171	0
Total other (expense) income	(320)	7,234
(Loss) income before income tax benefit (expense)	(24,472)	26,215
Income tax benefit (expense)	139	(572)
Net (loss) income	(24,333)	25,643
Foreign exchange translation adjustment	173	(231)
Pension adjustment	441	0
Comprehensive (loss) income	$ (23,719)	$ 25,412
Per share data:
Net (loss) income per basic share (in dollars per share)	$ (0.65)	$ 0.75
Weighted-average number of basic shares outstanding (in shares)	37,269	34,020
Net (loss) income per diluted share (in dollars per share)	$ (0.65)	$ 0.72
Weighted-average number of diluted shares outstanding (in shares)	37,269	35,789