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