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Stock-Based Compensation (Details) - shares
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 01, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2021
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Feb. 12, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Options outstanding under The 2020 Plan (in shares)   2,320,318 2,327,423 2,957,904 2,506,531 2,543,125 2,320,318 2,327,423 2,957,904 2,320,318 2,458,091 2,461,923
Common stock reserved for issuance (in shares)       9,764,014         9,764,014      
Percentage of outstanding shares       5.00%         5.00%      
Maximum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting period                 4 years      
Restricted Stock Awards (RSA)                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Restricted stock granted (in shares)   12,000 123,501                  
Vesting of restricted stock units (in shares)     98,450                  
Restricted Stock Units (RSUs)                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Restricted stock granted (in shares)       307,640 35,000 137,452 0 816,180 342,640 816,180    
Vesting of restricted stock units (in shares)       9,750     0 4,000 12,750 4,000    
Percentage vesting       25.00%                
Award vesting period       4 years 3 years              
Restricted Stock Units (RSUs) | Period 1                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Percentage vesting                 33.33%      
Restricted Stock Units (RSUs) | Period 2                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Percentage vesting                 33.33%      
Restricted Stock Units (RSUs) | Period 3                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Percentage vesting                 33.33%      
Restricted Stock Units (RSUs) | Period 4                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Percentage vesting         25.00%              
Award vesting period         1 year              
The 2020 Equity Incentive Plan                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Options outstanding under The 2020 Plan (in shares)       2,957,904         2,957,904      
Common stock reserved for issuance (in shares)       2,816,038         2,816,038      
Annual increase in shares available for issue (in shares) 2,026,599                      
Number of shares authorized by 2020 plan (in shares)       5,050,000         5,050,000      
The 2020 Equity Incentive Plan | Maximum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Annual increase in shares available for issue (in shares)                 5,000,000      
Options authorized (in shares)                 2,461,923      
The 2020 Equity Incentive Plan | Restricted Stock Awards (RSA)                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Equity Awards outstanding under The 2020 Plan (in shares)       1,248,007         1,248,007      
Transphorm Technology 2007 Stock Plan and 2015 Equity Incentive Plan                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Options outstanding under The 2020 Plan (in shares)                       29,703,285
Number of shares authorized by 2020 plan (in shares)       2,588,077         2,588,077