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Share Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 23, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
May 31, 2018
Dec. 31, 2017
Share-based compensation              
Maximum number of common shares may be issued           54,647,000  
Share-based compensation expense   $ 1,502 $ 322 $ 3,119 $ 550    
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            
Authorized shares outstanding (in shares)   4,620,850   4,620,850      
2015 Equity Incentive Plan | Class A common shares | Employees and directors              
Share-based compensation              
Number of options granted       2,887,639 1,434,156    
2015 Equity Incentive Plan | Class A common shares | Non-employees              
Share-based compensation              
Number of options granted       4,000 1,829    
Stock options | 2018 Incentive Award Plan | Class A common shares              
Share-based compensation              
Total number of common shares authorized to issue           4,466,500  
Share based payment award percentage of outstanding 4.00%            
Number of common shares available for future grant   3,280,059   3,280,059      
Stock options | 2018 Incentive Award Plan | Class A common shares | Maximum              
Share-based compensation              
Maximum number of common shares may be issued 27,915,000            
Stock options | 2015 Equity Incentive Plan              
Share-based compensation              
Authorized shares outstanding (in shares)   5,860,168   5,860,168     3,123,064
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%      
Number of options granted       2,891,639      
Stock options | 2015 Equity Incentive Plan | Employees and directors              
Share-based compensation              
Share-based compensation expense   $ 1,414 321 $ 2,980 $ 540    
Stock options | 2015 Equity Incentive Plan | Minimum              
Share-based compensation              
Vesting period       4 years      
Stock options | 2015 Equity Incentive Plan | 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      
Stock options | 2015 Equity Incentive Plan | Class A common shares              
Share-based compensation              
Total number of common shares authorized to issue   0   0     4,794,266
Number of common shares available for future grant   0   0     1,644,893
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%      
Stock options | 2015 Equity Incentive Plan | Class A common shares | Non-employees              
Share-based compensation              
Share-based compensation expense   $ 35 $ 1 $ 87 $ 10    
Stock options | 2018 Employee Share Purchase Plan | Class A common shares              
Share-based compensation              
Total number of common shares authorized to issue           670,000  
Share based payment award percentage of outstanding 1.00%            
Stock options | 2018 Employee Share Purchase Plan | Class A common shares | Maximum              
Share-based compensation              
Maximum number of common shares may be issued 6,420,000