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Share Based Compensation (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 10, 2019
item
May 23, 2018
shares
May 31, 2018
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
shares
Share-based compensation            
Share-based compensation expense | $       $ 4,209 $ 2,893  
Stock options | Class A common shares            
Share-based compensation            
Shares outstanding (in shares)       8,990,872   8,491,734
Number of options granted       1,455,250    
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           2,197,505
Number of common shares available for future grant       3,226,660    
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   3,477,438    
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%    
Vesting percentage of options having six year vesting term on the first anniversary of the grant date       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%    
Minimum percentage of exercise price of the fair market value of shares for the persons possessing more than 10% of voting power       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    
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