Quarterly report pursuant to Section 13 or 15(d)

Customer Concentrations and Accounts Receivable - Customer Concentrations (Details)

v3.19.3
Customer Concentrations and Accounts Receivable - Customer Concentrations (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Revenue | Customer concentrations | E-Finity          
Customer Concentrations and Accounts Receivable          
Concentration percentage 17.00% 12.00% 15.00% 11.00%  
Revenue | Customer concentrations | Cal          
Customer Concentrations and Accounts Receivable          
Concentration percentage 12.00%   11.00%    
Revenue | Customer concentrations | Horizon          
Customer Concentrations and Accounts Receivable          
Concentration percentage   15.00%   10.00%  
Revenue | Customer concentrations | Spetco International          
Customer Concentrations and Accounts Receivable          
Concentration percentage   10.00%      
Net accounts receivable | Credit concentration | E-Finity          
Customer Concentrations and Accounts Receivable          
Concentration percentage     13.00%   10.00%
Net accounts receivable | Credit concentration | Cal          
Customer Concentrations and Accounts Receivable          
Concentration percentage     10.00%    
Net accounts receivable | Credit concentration | Reliable Secure Power Systems          
Customer Concentrations and Accounts Receivable          
Concentration percentage         14.00%