Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Revenue from External Customer [Line Items]
Managed service contracts, right to refund, period			30 days
Total sales	$ 16,095	$ 16,350	$ 32,667	$ 35,330
Product
Revenue from External Customer [Line Items]
Sales	12,273	13,566	25,469	29,241
Total sales	12,296	13,603	25,518	29,314
Service
Revenue from External Customer [Line Items]
Sales	3,799	2,747	7,149	6,016
Total sales	3,799	2,747	7,149	6,016
Finance
Revenue from External Customer [Line Items]
Finance	23	37	49	73
High Performance Products Segment
Revenue from External Customer [Line Items]
Total sales	1,475	1,614	2,516	3,640
High Performance Products Segment | Product
Revenue from External Customer [Line Items]
Sales	922	1,375	1,689	3,108
Total sales	922	1,375	1,689	3,108
High Performance Products Segment | Service
Revenue from External Customer [Line Items]
Sales	553	239	827	532
Total sales	553	239	827	532
TS
Revenue from External Customer [Line Items]
Total sales	14,620	14,736	30,151	31,690
TS | U.K.
Revenue from External Customer [Line Items]
Total sales	268	1,983	947	3,785
TS | U.S.
Revenue from External Customer [Line Items]
Total sales	14,352	12,753	29,204	27,905
TS | Product
Revenue from External Customer [Line Items]
Sales	11,351	12,191	23,780	26,133
Total sales	11,374	12,228	23,829	26,206
TS | Product | U.K.
Revenue from External Customer [Line Items]
Sales	184	1,888	737	3,620
Total sales	184	1,888	737	3,620
TS | Product | U.S.
Revenue from External Customer [Line Items]
Sales	11,167	10,303	23,043	22,513
Total sales	11,190	10,340	23,092	22,586
TS | Service
Revenue from External Customer [Line Items]
Sales	3,246	2,508	6,322	5,484
Total sales	3,246	2,508	6,322	5,484
TS | Service | U.K.
Revenue from External Customer [Line Items]
Sales	84	95	210	165
Total sales	84	95	210	165
TS | Service | U.S.
Revenue from External Customer [Line Items]
Sales	3,162	2,413	6,112	5,319
Total sales	3,162	2,413	6,112	5,319
TS | Finance
Revenue from External Customer [Line Items]
Finance	23	37	49	73
TS | Finance | U.S.
Revenue from External Customer [Line Items]
Finance	$ 23	$ 37	$ 49	$ 73