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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue from External Customer [Line Items]        
Managed service contracts, right to refund, period     30 days  
Total sales $ 13,721 $ 13,780 $ 39,197 $ 47,521
Product        
Revenue from External Customer [Line Items]        
Sales 10,140 10,380 29,506 37,036
Total sales 10,142 10,399 29,526 37,104
Service        
Revenue from External Customer [Line Items]        
Sales 3,579 3,381 9,671 10,417
Total sales 3,579 3,381 9,671 10,417
Finance        
Revenue from External Customer [Line Items]        
Finance 2 19 20 68
High Performance Products Segment        
Revenue from External Customer [Line Items]        
Total sales 958 1,583 3,402 4,099
High Performance Products Segment | Product        
Revenue from External Customer [Line Items]        
Sales 602 780 2,494 2,469
Total sales 602 780 2,494 2,469
High Performance Products Segment | Service        
Revenue from External Customer [Line Items]        
Sales 356 803 908 1,630
Total sales 356 803 908 1,630
TS        
Revenue from External Customer [Line Items]        
Total sales 12,763 12,197 35,795 43,422
TS | U.K.        
Revenue from External Customer [Line Items]        
Total sales 213 207 2,034 1,154
TS | U.S.        
Revenue from External Customer [Line Items]        
Total sales 12,550 11,990 33,761 42,268
TS | Product        
Revenue from External Customer [Line Items]        
Sales 9,538 9,600 27,012 34,567
Total sales 9,540 9,619 27,032 34,635
TS | Product | U.K.        
Revenue from External Customer [Line Items]        
Sales 130 75 1,774 812
Total sales 130 75 1,774 812
TS | Product | U.S.        
Revenue from External Customer [Line Items]        
Sales 9,408 9,525 25,238 33,755
Total sales 9,410 9,544 25,258 33,823
TS | Service        
Revenue from External Customer [Line Items]        
Sales 3,223 2,578 8,763 8,787
Total sales 3,223 2,578 8,763 8,787
TS | Service | U.K.        
Revenue from External Customer [Line Items]        
Sales 83 132 260 342
Total sales 83 132 260 342
TS | Service | U.S.        
Revenue from External Customer [Line Items]        
Sales 3,140 2,446 8,503 8,445
Total sales 3,140 2,446 8,503 8,445
TS | Finance        
Revenue from External Customer [Line Items]        
Finance 2 19 20 68
TS | Finance | U.S.        
Revenue from External Customer [Line Items]        
Finance $ 2 $ 19 $ 20 $ 68