Basis of Presentation - Revision of Prior Period Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Sales:
Total sales	$ 14,088	$ 16,883	$ 25,476	$ 33,741
Cost of sales:
Total cost of sales	9,720	12,400	17,730	25,227
Gross profit	4,368	4,483	7,746	8,514
Operating loss	(121)	(143)	(658)	(545)
Net loss	$ (847)	$ (732)	$ 304	$ (1,272)
Net (loss) income per share – basic	$ (0.20)	$ (0.18)	$ 0.07	$ (0.32)
Net (loss) income per share – diluted	$ (0.20)	$ (0.18)	$ 0.07	$ (0.32)
Product
Sales:
Total sales	$ 10,976	$ 13,146	$ 19,384	$ 26,705
Cost of sales:
Total cost of sales	8,553	11,033	15,502	22,637
Service
Sales:
Total sales	3,112	3,737	6,092	7,036
Cost of sales:
Total cost of sales	$ 1,167	1,367	$ 2,228	2,590
As Reported
Sales:
Total sales		16,095		32,667
Cost of sales:
Total cost of sales		11,612		24,153
Gross profit		4,483		8,514
Operating loss		(143)		(545)
Net loss		$ (732)		$ (1,272)
Net (loss) income per share – basic		$ (0.18)		$ (0.32)
Net (loss) income per share – diluted		$ (0.18)		$ (0.32)
As Reported | Product
Sales:
Total sales		$ 12,296		$ 25,518
Cost of sales:
Total cost of sales		10,245		21,563
As Reported | Service
Sales:
Total sales		3,799		7,149
Cost of sales:
Total cost of sales		1,367		2,590
Restatement Adjustment
Sales:
Total sales		788		1,074
Cost of sales:
Total cost of sales		788		1,074
Restatement Adjustment | Product
Sales:
Total sales		850		1,187
Cost of sales:
Total cost of sales		788		1,074
Restatement Adjustment | Service
Sales:
Total sales		$ (62)		$ (113)