Quarterly report pursuant to Section 13 or 15(d)

Customer Concentrations and Accounts Receivable (Details)

v3.20.4
Customer Concentrations and Accounts Receivable (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Customer Concentrations and Accounts Receivable          
Net bad debt recovery $ 0.2 $ 0.1 $ 0.2 $ 0.1  
Revenue | Customer Concentration Risk | Cal Microturbine          
Customer Concentrations and Accounts Receivable          
Concentration percentage (as a percent) 24.00%   16.00%    
Revenue | Customer Concentration Risk | Supernova Energy Services          
Customer Concentrations and Accounts Receivable          
Concentration percentage (as a percent) 12.00%        
Revenue | Customer Concentration Risk | Optimal Group Australia Pty Ltd          
Customer Concentrations and Accounts Receivable          
Concentration percentage (as a percent)   11.00%      
Revenue | Customer Concentration Risk | E-Finity          
Customer Concentrations and Accounts Receivable          
Concentration percentage (as a percent)       12.00%  
Accounts Receivable | Credit Concentration Risk | Cal Microturbine          
Customer Concentrations and Accounts Receivable          
Concentration percentage (as a percent)     14.00%   14.00%
Accounts Receivable | Credit Concentration Risk | E-Finity          
Customer Concentrations and Accounts Receivable          
Concentration percentage (as a percent)     18.00%   18.00%