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Stock-Based Compensation - Narrative (Details) - shares
3 Months Ended
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) 2,864,970   2,879,008 2,462,414 2,543,125
Common stock reserved for issuance (in shares) 12,692,038        
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        
Percentage of outstanding shares 5.00%        
Additional shares authorized (in shares)   2,668,965      
Shares issued under company plans (in shares) 2,864,970        
Common stock reserved for issuance (in shares) 5,564,177        
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) 938,925        
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