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Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Managed service contracts, right to refund, period |  |  |  |  |  | 30 days |
Finance |  |  |  |  |  | $ 83 | $ 135
Total sales | $ 13,780 | $ 16,883 | $ 16,858 | $ 33,741 | $ 47,521 | 61,793 | 79,061
Product |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  |  |  |  | 47,906 | 65,882
Total sales | 10,399 | 13,146 | 13,559 | 26,705 | 37,104 | 47,989 | 66,017
Service |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  |  |  |  | 13,804 | 13,044
Total sales | $ 3,381 | $ 3,737 | $ 3,299 | $ 7,036 | $ 10,417 | 13,804 | 13,044
High Performance Products Segment |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Total sales |  |  |  |  |  | 5,876 | 7,902
High Performance Products Segment | Product |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  |  |  |  | 3,401 | 6,406
Total sales |  |  |  |  |  | 3,401 | 6,406
High Performance Products Segment | Service |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  |  |  |  | 2,475 | 1,496
Total sales |  |  |  |  |  | 2,475 | 1,496
TS |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Finance |  |  |  |  |  | 83 | 135
Total sales |  |  |  |  |  | 55,917 | 71,159
TS | U.K. |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Total sales |  |  |  |  |  | 1,383 | 5,316
TS | U.S. |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Finance |  |  |  |  |  | 83 | 135
Total sales |  |  |  |  |  | 54,534 | 65,843
TS | Product |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  |  |  |  | 44,505 | 59,476
Total sales |  |  |  |  |  | 44,588 | 59,611
TS | Product | U.K. |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  |  |  |  | 943 | 4,936
Total sales |  |  |  |  |  | 943 | 4,936
TS | Product | U.S. |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  |  |  |  | 43,562 | 54,540
Total sales |  |  |  |  |  | 43,645 | 54,675
TS | Service |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  |  |  |  | 11,329 | 11,548
Total sales |  |  |  |  |  | 11,329 | 11,548
TS | Service | U.K. |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  |  |  |  | 440 | 380
Total sales |  |  |  |  |  | 440 | 380
TS | Service | U.S. |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |
Sales |  |  |  |  |  | 10,889 | 11,168
Total sales |  |  |  |  |  | $ 10,889 | $ 11,168

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