Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Risk Concentrations - Accounts Receivable (Details)

v3.20.1
Summary of Significant Accounting Policies - Risk Concentrations - Accounts Receivable (Details) - Accounts Receivable - Credit Concentration Risk
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
E-Finity    
Risk Concentrations    
Concentration percentage (as a percent) 14.00% 10.00%
Reliable Secure Power Systems    
Risk Concentrations    
Concentration percentage (as a percent)   14.00%