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Share Based Compensation (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 10, 2019
item
May 23, 2018
shares
Dec. 31, 2019
shares
May 31, 2018
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Share-based compensation            
Maximum number of common shares may be issued       54,647,000    
Share-based compensation expense | $         $ 15,080 $ 5,701
Stock options | Employees and Directors            
Share-based compensation            
Share-based compensation expense | $         13,322 5,464
Stock options | Non-employees            
Share-based compensation            
Share-based compensation expense | $         $ 94 $ 130
Stock options | Class A common shares            
Share-based compensation            
Shares outstanding (in shares)     8,491,734   8,491,734 5,960,939
Number of options granted         3,608,588  
Stock options | Class A common shares | Employees and Directors            
Share-based compensation            
Number of options granted         3,605,388 3,114,139
Stock options | Class A common shares | Non-employees            
Share-based compensation            
Number of options granted         3,200 4,000
First RSU Award            
Share-based compensation            
Share-based compensation expense | $         $ 0  
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         1,979,586  
Number of common shares available for future grant     2,145,907   2,145,907  
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 4,125,923   4,125,923  
Number of shares no longer available for future grant   92,170        
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%  
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            
Total number of common shares authorized to issue     0   0  
Number of common shares available for future grant   0        
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    
Automatic increase in number of shares available for issue     0      
Number of common shares available for future grant     598,334   598,334  
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