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Stock-Based Compensation - Narrative (Details) - shares
3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Jun. 30, 2022
Apr. 01, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued under company plans (in shares) 3,045,662 2,506,531 3,045,662 2,864,970   2,879,008 2,462,414 2,543,125
Restricted Stock Units (RSUs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares granted (in shares) 164,440 35,000            
Award vesting period 4 years              
Restricted Stock Units (RSUs) | Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage   25.00%            
Award vesting period   1 year            
Restricted Stock Units (RSUs) | Tranche Two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period   3 years            
The 2020 Equity Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized by 2020 plan (in shares) 5,050,000   5,050,000          
Percentage of outstanding shares (in percent) 5.00%   5.00%          
Additional shares authorized (in shares)         2,668,965      
Shares issued under company plans (in shares) 3,045,662   3,045,662          
Number of shares available for grant (in shares) 5,254,790   5,254,790          
The 2020 Equity Incentive Plan | Restricted Stock Units (RSUs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity awards outstanding under The 2020 Plan (in shares) 1,027,754   1,027,754          
The 2020 Equity Incentive Plan | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options authorized (in shares)     2,461,923          
Annual increase in shares available for issue (in shares)     5,000,000          
Transphorm Technology 2007 Stock Plan and 2015 Equity Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized by 2020 plan (in shares) 2,588,077   2,588,077