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Stock Based Compensation (Details) - shares
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved for issuance (in shares)   5,201,940 5,201,940
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
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved for issuance (in shares)   5,042,525 5,042,525
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock granted (in shares)   816,180 816,180
Equity awards immediately vested   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) 123,501 12,000 135,501
Equity awards immediately vested 98,450   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)   1,916,882 1,916,882
Equity Awards outstanding under The 2020 Plan (in shares)   805,325 805,325
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]      
Options authorized (in shares)     2,461,923
Annual increase in shares available for issue     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