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Stock-Based Compensation - Narratives (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 10, 2021
Feb. 09, 2021
Sep. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock reserved for future issuance (in shares)       9,923,185   9,923,185   6,577,312  
Expected dividend yield           0.00% 0.00%    
Unrecognized compensation expense       $ 3.9   $ 3.9      
Unrecognized compensation expense, period for recognition, years           2 years 7 months 6 days      
PSARs liability       0.7   $ 0.7      
Long term Debt                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
PSARs liability               $ 0.9  
Equity And Incentive Compensation Plan 2021 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for issuance (in shares)   4,262,364              
Expiration period   10 years              
Increase in shares authorized as percent of outstanding shares of common stock   4.00%              
Granted (in shares)           0      
Equity Incentive Plan 2018 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for issuance (in shares)                 6,287,687
Employee stock option                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Options to purchase common stock, vested (in shares) 829,547                
Granted (in shares)           965,944      
Exercised (in shares)           0      
Fair value of options vested       0.0 $ 0.3 $ 2.1 $ 0.7    
Weighted average grant date fair value, options granted (in dollars per share)           $ 4.63 $ 2.02    
Unvested restricted stock units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vested (in shares) 288,494         313,976      
Fair value of options vested           $ 1.4 $ 1.4    
Phantom Stock Appreciation Rights Psars [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (in shares)     91,500            
Vesting period               4 years  
Cliff period               1 year  
Stock Options And Restricted Stock Unit Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Impact of acceleration of vesting of awards       $ 0.0   $ 3.1