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Share Based Compensation (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 23, 2018
shares
Dec. 31, 2019
item
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
shares
Share-based compensation              
Share-based compensation expense | $     $ 4,851 $ 3,464 $ 9,060 $ 6,357  
Stock options | Class A common shares              
Share-based compensation              
Shares outstanding (in shares)   8,491,734 8,683,380   8,683,380   8,491,734
Number of options granted         1,956,670    
First RSU Award              
Share-based compensation              
Share-based compensation expense | $     $ 0   $ 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   2,197,505          
Number of common shares available for future grant     3,112,910   3,112,910    
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 | 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%          
2015 Equity Incentive Plan | Class A common shares              
Share-based compensation              
Total number of common shares authorized to issue 4,691,213   3,001,826   3,001,826    
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 | Employees              
Share-based compensation              
Vesting period         6 years    
2015 Equity Incentive Plan | Stock options | Employees and non employees              
Share-based compensation              
Vesting period         4 years    
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            
Automatic increase in number of shares available for issue             0
Number of common shares available for future grant     549,300   549,300    
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