Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total sales	$ 23,759	$ 12,667	$ 42,449	$ 25,416
Operating segments
Disaggregation of Revenue [Line Items]
Total sales	23,759	12,667	42,449	25,416
Telco | Operating segments
Disaggregation of Revenue [Line Items]
Total sales	15,993	8,333	27,564	15,835
Wireless services
Disaggregation of Revenue [Line Items]
Total sales	7,767	4,334	14,885	9,581
Telco equipment | Telco | Operating segments
Disaggregation of Revenue [Line Items]
Total sales	15,986	8,189	27,410	15,464
Telco repair
Disaggregation of Revenue [Line Items]
Total sales	6	7	18	13
Telco recycle
Disaggregation of Revenue [Line Items]
Total sales	$ 0	$ 137	$ 136	$ 358