Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total sales	$ 18,690	$ 12,749
Operating segments
Disaggregation of Revenue [Line Items]
Total sales	18,690	12,749
Operating segments | Wireless
Disaggregation of Revenue [Line Items]
Total sales	7,119	5,246
Telco equipment sales | Operating segments | Telco equipment sales
Disaggregation of Revenue [Line Items]
Total sales	11,424	7,275
Telco repair sales | Operating segments | Telco equipment sales
Disaggregation of Revenue [Line Items]
Total sales	11	6
Telco recycle sales | Operating segments | Telco equipment sales
Disaggregation of Revenue [Line Items]
Total sales	$ 136	$ 222