Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total sales	$ 12,667	$ 11,959	$ 25,416	$ 25,921
Total gross profit (loss)	3,181	(439)	6,810	3,153
Total loss from operations	(3,047)	(14,679)	(4,961)	$ (16,442)
Segment assets	28,558		$ 28,558		$ 32,503
Operating segments
Segment Reporting Information [Line Items]
Total gross profit (loss)	$ 3,181	$ (439)
Total gross profit margin (loss)	25.00%	(4.00%)	27.00%	12.00%
Non-allocated
Segment Reporting Information [Line Items]
Segment assets	$ 10,369		$ 10,369		14,881
Wireless | Operating segments
Segment Reporting Information [Line Items]
Total sales	4,334	$ 4,672	9,581	$ 11,470
Total gross profit (loss)	$ 1,527	$ 175	$ 3,136	$ 2,048
Total gross profit margin (loss)	35.00%	4.00%	33.00%	18.00%
Total loss from operations	$ (1,537)	$ (2,453)	$ (2,642)	$ (3,235)
Segment assets	5,170		5,170		5,324
Telco | Operating segments
Segment Reporting Information [Line Items]
Total sales	8,333	7,287	15,835	14,451
Total gross profit (loss)	$ 1,654	$ (614)	$ 3,674	$ 1,105
Total gross profit margin (loss)	20.00%	(8.00%)	23.00%	8.00%
Total loss from operations	$ (1,510)	$ (12,226)	$ (2,319)	$ (13,207)
Segment assets	$ 13,019		$ 13,019		$ 12,298