Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Narrative (Details)

v3.20.4
Subsequent Events - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 01, 2021
Feb. 28, 2021
Jan. 21, 2021
Jan. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Feb. 19, 2019
Granted (in shares)         1,036,000 648,550  
Granted, weighted average exercise price (in dollars per share)         $ 9.38 $ 6.03  
Share price (in dollars per share)             $ 4.87
Subsequent Event              
Expected dividends     $ 0        
Severance period 9 months 12 months          
Non-solicitation and non-competition period 12 months 9 months          
Executive severance benefits period 6 months            
Employee Stock Option              
Expiration period (in years)       10 years   10 years  
Fair value of options       $ 500,000 $ 7,000,000.0 $ 2,800,000  
Discount rate       2.53%      
Expected life (in years)       5 years 3 months 7 days      
Expected volatility rate       84.30%      
Expected dividends       $ 0 $ 0    
Employee Stock Option | Subsequent Event              
Expiration period (in years)     10 years        
Award vesting rights, percentage     25.00%        
Vesting period (in years)     4 years        
Fair value of options     $ 300,000        
Discount rate     0.19%        
Expected life (in years)     6 years 3 months        
Expected volatility rate     88.90%        
Share price (in dollars per share)     $ 9.74        
Employee Stock Option | Subsequent Event | 2018 Stock Plan              
Expiration period (in years)     10 years        
Award vesting rights, percentage     25.00%        
Vesting period (in years)     4 years        
Certain Individuals              
Granted (in shares)       401,750 1,036,000 246,800  
Granted, weighted average exercise price (in dollars per share)       $ 1.75 $ 9.38 $ 13.00  
Certain Individuals | Subsequent Event              
Granted (in shares)     38,750        
Granted, weighted average exercise price (in dollars per share)     $ 9.74        
Certain Individuals | Subsequent Event | 2018 Stock Plan              
Granted (in shares)     372,900        
Granted, weighted average exercise price (in dollars per share)     $ 9.74