Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Risk Concentrations (Details)

v3.21.1
Summary of Significant Accounting Policies - Risk Concentrations (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Risk Concentrations    
Aggregate balances that exceed insurance coverage $ 48,600  
Recovery of bad debt $ 228  
Provision for accounts receivable allowances   $ 431
Revenue | Customer concentrations | E-Finity    
Risk Concentrations    
Concentration percentage (as a percent)   12.00%
Revenue from Contract with Customer Benchmark | Customer concentrations | Cal Microturbine    
Risk Concentrations    
Concentration percentage (as a percent) 15.00%  
Revenue from Contract with Customer Benchmark | Customer concentrations | E-Finity    
Risk Concentrations    
Concentration percentage (as a percent) 12.00%  
Net accounts receivable | Credit concentration | E-Finity    
Risk Concentrations    
Concentration percentage (as a percent) 13.00% 14.00%