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Stock Based Compensation (Details) - shares
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2021
Sep. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for issuance (in shares)     5,198,440    
Percentage of outstanding shares     5.00%    
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     4 years    
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for issuance (in shares)     5,039,025    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock granted (in shares)     137,452 816,180 816,180
Equity awards immediately vested (in shares)     3,000 4,000 4,000
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%    
Restricted Stock Awards (RSA)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock granted (in shares) 12,000 123,501 0   135,501
Equity awards immediately vested (in shares)   98,450 37,051   98,450
Restricted Stock Awards (RSA) | Period 2          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     120 days    
The 2020 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for issuance (in shares)     1,560,503    
Equity Awards outstanding under The 2020 Plan (in shares)     935,397    
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]          
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