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Stock-Based Compensation - Narratives (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Feb. 10, 2021
Feb. 09, 2021
Dec. 31, 2019
Sep. 30, 2020
Mar. 31, 2021
Mar. 31, 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)         10,248,025   6,577,312  
Expected dividend yield         0.00% 0.00%    
Unrecognized compensation expense         $ 4,200      
Unrecognized compensation expense, period for recognition, years         2 years 10 months 24 days      
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         $ 2,100 $ 400    
Weighted average grant date fair value, options granted (in dollars per share)         $ 4.63 $ 2.02    
Restricted stock units (RSUs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vested (in shares) 288,494       313,976      
Fair value of options vested         $ 1,400 $ 400    
Number of outstanding and fully vested restricted stock units, unsettled (in shares)         2,045,634      
Phantom Stock Appreciation Rights (PSARs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)       91,500        
Vesting period     4 years          
Phantom Stock Appreciation Rights (PSARs) | Long-term Debt                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
PSARs liability         $ 1,073   $ 858  
Stock Options and Restricted Stock Unit Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Impact of acceleration of vesting of awards         $ 3,100      
2018 Equity incentive plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized for issuance (in shares)               6,287,687
2021 equity and incentive compensation plan                
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