v3.19.2
Shareholders' equity (deficit) - Share-based compensation - Outstanding and exercisable options (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Outstanding and exercisable options, number of shares        
Outstanding at beginning of period     2,295,045 968,782
Forfeited/cancelled       (12,198)
Exercised     (18,153) (42,781)
Outstanding at end of period 2,440,629 1,801,235 2,440,629 1,801,235
Exercisable at end of period 771,478 563,565 771,478 563,565
Outstanding and exercisable options, weighted average exercise price        
Outstanding at beginning of period     $ 1.7714 $ 1.1330
Forfeited/expired       1.0958
Granted     7.8518 1.1114
Exercised     1.3225 0.8298
Outstanding at end of period $ 2.3963 $ 1.3405 2.3963 1.3405
Exercisable at end of period $ 1.3777 $ 1.0266 $ 1.3777 $ 1.0266
Weighted average remaining contractual life (in years)     8 years 3 months 18 days 8 years 7 months 6 days
Weighted average remaining contractual life for vested options (in years)     6 years 7 months 6 days 6 years 10 months 24 days
Options forfeited     0 12,198
Share-based compensation expense $ 276 $ 80 $ 487 $ 204
Unrecognized compensation cost $ 3,434 $ 1,360 $ 3,434 $ 1,360
Expected period for recognition     2 years 10 months 24 days 3 years 2 months 12 days
2011 Plan        
Outstanding and exercisable options, number of shares        
Granted     116,739 887,432
Outstanding at end of period 2,393,631   2,393,631  
Outstanding and exercisable options, weighted average exercise price        
Granted     $ 9.4152 $ 1.5400
2019 Plan        
Outstanding and exercisable options, number of shares        
Granted     46,998  
Outstanding and exercisable options, weighted average exercise price        
Granted     $ 15.0000