Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue	$ 32,650	$ 38,406	$ 74,886	$ 71,832
Cost of revenue	23,633	23,772	50,072	44,626
Gross profit	9,017	14,634	24,814	27,206
Operating expense:
Selling, general, and administrative	7,563	6,062	14,750	11,860
Research and development	4,535	3,771	9,162	8,067
Severance	20	0	1,318	0
(Gain) loss on sale of assets	(788)	218	(601)	189
Total operating expense	11,330	10,051	24,629	20,116
Operating (loss) income	(2,313)	4,583	185	7,090
Other (expense) income:
Interest expense, net	(12)	(49)	(23)	(98)
Foreign exchange (loss) gain	(17)	(68)	25	169
Total other (expense) income	(29)	(117)	2	71
(Loss) income before income tax benefit (expense)	(2,342)	4,466	187	7,161
Income tax benefit (expense)	117	(82)	2	(208)
Net (loss) income	(2,225)	4,384	189	6,953
Foreign exchange translation adjustment	2	(11)	22	(21)
Comprehensive (loss) income	$ (2,223)	$ 4,373	$ 211	$ 6,932
Per share data
Net income per basic share (in dollars per share)	$ (0.06)	$ 0.13	$ 0.01	$ 0.22
Weighted-average number of basic shares outstanding (in shares)	37,217	32,968	37,082	31,219
Net income per diluted share (in dollars per share)	$ (0.06)	$ 0.13	$ 0.01	$ 0.21
Weighted-average number of diluted shares outstanding (in shares)	37,217	34,451	38,384	32,492