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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue from External Customer [Line Items]        
Managed service contracts, right to refund, period     30 days  
Total sales $ 13,532 $ 21,570 $ 46,199 $ 56,900
Product        
Revenue from External Customer [Line Items]        
Sales 10,275 18,043 35,744 47,284
Total sales 10,294 18,076 35,812 47,390
Service        
Revenue from External Customer [Line Items]        
Sales 3,238 3,494 10,387 9,510
Total sales 3,238 3,494 10,387 9,510
Finance        
Revenue from External Customer [Line Items]        
Finance 19 33 68 106
High Performance Products Segment        
Revenue from External Customer [Line Items]        
Total sales 1,583 2,140 4,099 5,780
High Performance Products Segment | Product        
Revenue from External Customer [Line Items]        
Sales 780 1,592 2,469 4,700
Total sales 780 1,592 2,469 4,700
High Performance Products Segment | Service        
Revenue from External Customer [Line Items]        
Sales 803 548 1,630 1,080
Total sales 803 548 1,630 1,080
TS        
Revenue from External Customer [Line Items]        
Total sales 11,949 19,430 42,100 51,120
TS | U.K.        
Revenue from External Customer [Line Items]        
Total sales 207 829 1,154 4,614
TS | U.S.        
Revenue from External Customer [Line Items]        
Total sales 11,742 18,601 40,946 46,506
TS | Product        
Revenue from External Customer [Line Items]        
Sales 9,495 16,451 33,275 42,584
Total sales 9,514 16,484 33,343 42,690
TS | Product | U.K.        
Revenue from External Customer [Line Items]        
Sales 75 720 812 4,340
Total sales 75 720 812 4,340
TS | Product | U.S.        
Revenue from External Customer [Line Items]        
Sales 9,420 15,731 32,463 38,244
Total sales 9,439 15,764 32,531 38,350
TS | Service        
Revenue from External Customer [Line Items]        
Sales 2,435 2,946 8,757 8,430
Total sales 2,435 2,946 8,757 8,430
TS | Service | U.K.        
Revenue from External Customer [Line Items]        
Sales 132 109 342 274
Total sales 132 109 342 274
TS | Service | U.S.        
Revenue from External Customer [Line Items]        
Sales 2,303 2,837 8,415 8,156
Total sales 2,303 2,837 8,415 8,156
TS | Finance        
Revenue from External Customer [Line Items]        
Finance 19 33 68 106
TS | Finance | U.S.        
Revenue from External Customer [Line Items]        
Finance $ 19 $ 33 $ 68 $ 106