CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenue	$ 19,634	$ 24,250	$ 43,757	$ 44,229
Cost of revenue	16,387	19,389	34,422	34,989
Gross profit	3,247	4,861	9,335	9,240
Operating expense:
Selling, general, and administrative	6,037	9,089	12,646	18,378
Research and development	3,726	4,882	7,335	9,097
Severance	1,019	0	1,230	16
Impairment	88	0	88	0
Loss (gain) on sale of assets	0	24	(31)	(1,147)
Total operating expense	10,870	13,995	21,268	26,344
Operating loss	(7,623)	(9,134)	(11,933)	(17,104)
Other expense:
Interest expense, net	(67)	(195)	(76)	(410)
Other income (expense)	1	17	(15)	124
Total other expense	(66)	(178)	(91)	(286)
Loss from continuing operations before income tax expense	(7,689)	(9,312)	(12,024)	(17,390)
Income tax expense from continuing operations	(86)	(54)	(114)	(148)
Net loss from continuing operations	(7,775)	(9,366)	(12,138)	(17,538)
Loss from discontinued operations	(720)	(2,862)	(2,036)	(6,383)
Net loss	$ (8,495)	$ (12,228)	$ (14,174)	$ (23,921)
Per share data:
Net loss on continuing operations per share, basic (in dollars per share)	$ (0.87)	$ (2.07)	$ (1.36)	$ (4.24)
Net loss on continuing operations per share, diluted (in dollars per share)	(0.87)	(2.07)	(1.36)	(4.24)
Net loss on discontinued operations per share, basic (in dollars per share)	(0.08)	(0.63)	(0.23)	(1.54)
Net loss on discontinued operations per share, diluted (in dollars per share)	(0.08)	(0.63)	(0.23)	(1.54)
Net loss per share, basic (in dollars per share)	(0.95)	(2.70)	(1.59)	(5.78)
Net loss per share, diluted (in dollars per share)	$ (0.95)	$ (2.70)	$ (1.59)	$ (5.78)
Weighted-average number of shares outstanding, basic reflective of reverse stock split effective April 1, 2024 (in shares)	8,924	4,524	8,911	4,136
Weighted-average number of shares outstanding, diluted reflective of reverse stock split effective April 1, 2024 (in shares)	8,924	4,524	8,911	4,136