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Stock-Based Compensation - Narrative (Details) - shares
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2022
Dec. 31, 2020
Feb. 12, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued under company plans (in shares) 2,320,318   2,879,008     2,543,125   2,879,008 2,320,318 2,461,923 2,473,198
Equity Awards outstanding under The 2020 Plan (in shares)           0          
Common stock reserved for issuance (in shares)     9,365,141         9,365,141      
Percentage of outstanding shares     5.00%         5.00%      
Restricted stock granted (in shares)               0      
Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period               4 years      
Restricted Stock Units (RSUs)                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting of restricted stock units (in shares)     305,982     3,000 4,000   4,000    
Restricted stock granted (in shares)     342,640 307,640 35,000 137,452 816,180   816,180    
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            
Restricted Stock Awards (RSA)                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting of restricted stock units (in shares)   98,450 0     37,051     98,450    
Restricted stock granted (in shares) 12,000 123,501 0     0     135,501    
The 2020 Equity Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued under company plans (in shares)     2,879,008         2,879,008      
Common stock reserved for issuance (in shares)     2,874,060         2,874,060      
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 Units (RSUs)                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Equity Awards outstanding under The 2020 Plan (in shares)     954,775         954,775      
Transphorm Technology 2007 Stock Plan and 2015 Equity Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued under company plans (in shares)                   29,703,285  
Number of shares authorized by 2020 plan (in shares)     2,588,077         2,588,077