Segment and Revenue Information - Schedule of Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Revenue	$ 26,698	$ 23,675	$ 78,471	$ 98,561
Gross profit	3,500	3,898	10,270	28,712
R&D expense	5,171	4,513	16,319	13,675
Operating loss	(9,961)	(7,097)	(33,545)	(6,912)
Operating segments
Segment Reporting Information [Line Items]
Revenue	26,698	23,675	78,471	98,561
Operating loss	(1,671)	(615)	(6,049)	15,037
Operating segments | Aerospace And Defense
Segment Reporting Information [Line Items]
Revenue	27,001	13,416	73,879	32,322
Gross profit	7,163	1,551	16,786	4,468
R&D expense	4,448	3,834	14,050	12,037
Operating loss	2,715	(2,283)	2,736	(7,569)
Operating segments | Broadband
Segment Reporting Information [Line Items]
Revenue	(303)	10,259	4,592	66,239
Gross profit	(3,663)	2,347	(6,516)	24,244
R&D expense	723	679	2,269	1,638
Operating loss	$ (4,386)	$ 1,668	$ (8,785)	$ 22,606