Quarterly report pursuant to Section 13 or 15(d)

Customer Concentrations and Accounts Receivable - Customer Concentrations (Details)

v3.20.2
Customer Concentrations and Accounts Receivable - Customer Concentrations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Customer Concentrations and Accounts Receivable          
Net bad debt recovery $ 0.1 $ 0.1 $ 0.1 $ 0.1  
Revenue | Customer Concentration Risk | E-Quad          
Customer Concentrations and Accounts Receivable          
Concentration percentage (as a percent) 10.00%        
Revenue | Customer Concentration Risk | E-Finity          
Customer Concentrations and Accounts Receivable          
Concentration percentage (as a percent)   17.00% 10.00% 15.00%  
Revenue | Customer Concentration Risk | Cal Microturbine          
Customer Concentrations and Accounts Receivable          
Concentration percentage (as a percent)   12.00% 10.00% 11.00%  
Accounts Receivable | Credit Concentration Risk | E-Finity          
Customer Concentrations and Accounts Receivable          
Concentration percentage (as a percent)     12.00%   14.00%