Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 23,675	$ 42,658	$ 98,561	$ 114,490
Cost of revenue	19,777	25,433	69,849	70,059
Gross profit	3,898	17,225	28,712	44,431
Operating expense:
Selling, general, and administrative	7,800	6,081	22,550	17,941
Research and development	4,513	4,500	13,675	12,567
Severance	0	0	1,318	0
(Gain) loss on sale of assets	(1,318)	250	(1,919)	439
Total operating expense	10,995	10,831	35,624	30,947
Operating (loss) income	(7,097)	6,394	(6,912)	13,484
Other (expense) income:
Gain on extinguishment of debt	0	6,561	0	6,561
Interest (income) expense, net	9	579	(14)	481
Foreign exchange (loss) gain	(185)	87	(160)	256
Pension expense	(349)	0	(349)	0
Total other (expense) income	(525)	7,227	(523)	7,298
(Loss) income before income tax expense	(7,622)	13,621	(7,435)	20,782
Income tax expense	(27)	(6)	(25)	(214)
Net (loss) income	(7,649)	13,615	(7,460)	20,568
Foreign exchange translation adjustment	69	(5)	91	(26)
Comprehensive (loss) income	$ (7,580)	$ 13,610	$ (7,369)	$ 20,542
Per share data
Net (loss) income per basic share (in dollars per share)	$ (0.20)	$ 0.37	$ (0.20)	$ 0.62
Weighted-average number of basic shares outstanding (in shares)	37,425	36,768	37,197	33,069
Net (loss) income per diluted share (in dollars per share)	$ (0.20)	$ 0.35	$ (0.20)	$ 0.59
Weighted-average number of diluted shares outstanding (in shares)	37,425	38,893	37,197	34,777