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Share Based Compensation (Details)
$ in Thousands
1 Months Ended 12 Months Ended
May 23, 2018
shares
Dec. 31, 2020
shares
Dec. 31, 2019
item
shares
May 31, 2018
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Share-based compensation              
Maximum number of common shares may be issued       54,647,000      
Shares outstanding (in shares)   9,958,858 8,491,734   9,958,858 8,491,734  
Period of equal monthly vesting after first anniversary for options with six year vesting period         5 years    
Number of options granted         3,794,735    
Share-based compensation expense | $         $ 20,875 $ 15,080 $ 5,701
Stock options | Employees              
Share-based compensation              
Share-based compensation expense | $         20,860    
Stock options | Non-employees              
Share-based compensation              
Share-based compensation expense | $         $ 15    
2018 Incentive Award Plan | Class A common shares              
Share-based compensation              
Total number of common shares authorized to issue       4,466,500      
Percentage of automatic increase in shares available for issue         4.00%    
Additional shares authorized         2,197,505    
Number of common shares available for future grant   1,618,474     1,618,474    
2018 Incentive Award Plan | Class A common shares | Maximum              
Share-based compensation              
Percentage of automatic increase in shares available for issue       4.00%      
Maximum number of common shares may be issued       27,915,000      
Rilonacept Long-term Incentive Plan              
Share-based compensation              
Percentage of a participant's annual target bonus for grant year represented by cash award     33.30%        
Rilonacept Long-term Incentive Plan | Restricted Share Units (RSUs)              
Share-based compensation              
Number of grants of RSU awards that a participant may receive | item     2        
Number of awards that will be earned or vest if the milestone date does not occur by the specified date | item     0        
Rilonacept Long-term Incentive Plan | Restricted Share Units (RSUs) | Earnout Level 1              
Share-based compensation              
Potential performance earnout percentage     100.00%        
Rilonacept Long-term Incentive Plan | Restricted Share Units (RSUs) | Earnout Level 2              
Share-based compensation              
Potential performance earnout percentage     50.00%        
Rilonacept Long-term Incentive Plan | Restricted Share Units (RSUs) | Earnout Level 3              
Share-based compensation              
Potential performance earnout percentage     25.00%        
Rilonacept Long-term Incentive Plan | Restricted Share Units (RSUs) | Earnout Level 4              
Share-based compensation              
Potential performance earnout percentage     0.00%        
Rilonacept Long-term Incentive Plan | Restricted Share Units (RSUs) | Upside Earnout Level 1              
Share-based compensation              
Potential performance earnout percentage     50.00%        
Rilonacept Long-term Incentive Plan | Restricted Share Units (RSUs) | Upside Earnout Level 2              
Share-based compensation              
Potential performance earnout percentage     25.00%        
Rilonacept Long-term Incentive Plan | Restricted Share Units (RSUs) | Upside Earnout Level 3              
Share-based compensation              
Potential performance earnout percentage     0.00%        
Rilonacept Long-term Incentive Plan | First RSU Award              
Share-based compensation              
Percentage of a participant's annual target bonus for grant year that each RSU grant award represents     33.30%        
Vesting period     1 year        
Rilonacept Long-term Incentive Plan | Second RSU Award              
Share-based compensation              
Percentage of a participant's annual target bonus for grant year that each RSU grant award represents     33.30%        
Vesting period     2 years        
2015 Equity Incentive Plan | Class A common shares              
Share-based compensation              
Total number of common shares authorized to issue 4,691,213            
Number of shares no longer available for future grant 92,170            
Number of common shares available for future grant 0            
Shares outstanding (in shares)   2,794,056     2,794,056    
2015 Equity Incentive Plan | Stock options              
Share-based compensation              
Voting power threshold percentage used to determine the exercise price for options         10.00%    
Vesting percentage of options having four year vesting term on the first anniversary of the grant date   25.00%     25.00%    
Period of equal monthly vesting after first anniversary for options with four year vesting period         3 years    
Vesting percentage of options having six year vesting term on the first anniversary of the grant date   16.00%     16.00%    
2015 Equity Incentive Plan | Stock options | Minimum              
Share-based compensation              
Vesting period         4 years    
2015 Equity Incentive Plan | Stock options | Maximum              
Share-based compensation              
Option term of incentive awards         10 years    
Option term of awards for the persons possessing more than 10% of voting power         5 years    
Vesting period         6 years    
2015 Equity Incentive Plan | Stock options | Class A common shares              
Share-based compensation              
Minimum percentage of exercise price of the fair market value of shares for the persons possessing 10% or less of voting power   100.00%     100.00%    
Minimum percentage of exercise price of the fair market value of shares for the persons possessing more than 10% of voting power   110.00%     110.00%    
2018 Employee Share Purchase Plan | Class A common shares              
Share-based compensation              
Total number of common shares authorized to issue       670,000      
Additional shares authorized   130,000          
Number of common shares available for future grant   518,794     518,794    
2018 Employee Share Purchase Plan | Class A common shares | Maximum              
Share-based compensation              
Percentage of automatic increase in shares available for issue 1.00%            
Maximum number of common shares may be issued 6,420,000