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Stock Based Compensation (Details) - shares
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 01, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Mar. 31, 2021
Jun. 30, 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)       2,462,414   2,543,125 2,454,687 2,458,091 2,461,923
Common stock reserved for issuance (in shares)       7,192,114          
Percentage of outstanding shares       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            
Equity awards immediately vested (in shares)     98,450            
Restricted Stock Units (RSUs)                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Restricted stock granted (in shares)       137,452 816,180 0      
Equity awards immediately vested (in shares)         4,000 1,000      
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%          
The 2020 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Options outstanding under The 2020 Plan (in shares)       2,462,414          
Common stock reserved for issuance (in shares)       3,648,248          
Annual increase in shares available for issue (in shares) 2,026,599                
Number of shares authorized by 2020 plan (in shares)       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)       922,037          
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