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Stock based awards - Stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Jun. 30, 2019
Jun. 30, 2019
Number of options      
Balance Outstanding, Beginning of the period (in shares)     1,839,913
Options granted ( in shares)     1,228,352
Options exercised ( in shares)     (647,757)
Balance Outstanding, End of the period (in shares) 1,839,913 2,420,508 2,420,508
Exercisable ( in shares)   23,691 23,691
Vested and expected to vest ( in shares)   2,420,508 2,420,508
Weighted-Average Exercise Price per Share      
Weighted-average exercise price, Beginning of the period (in dollars per share)     $ 0.61
Weighted-average exercise price, Granted (in dollars per share)     7.61
Weighted-average exercise price, Exercised (in dollars per share)     0.62
Weighted-average exercise price, End of the period (in dollars per share) $ 0.61 $ 4.17 4.17
Weighted-average exercise price, Exercisable ( in dollars per share )   4.17 4.17
Weighted-average exercise price, Vested and expected to vest at end of the period (in dollars per share)   $ 4.29 $ 4.29
Weighted-Average remaining contractual term (years) and Aggregate Intrinsic Value      
Weighted-average remaining contractual term outstanding (in years) 9 years 8 months 27 days   9 years 5 months 23 days
Weighted-average remaining contractual term , Options Exercisable(in years)     9 years 5 months 1 day
Weighted-average remaining contractual term vested and expected to vest (in years)     9 years 5 months 23 days
Aggregate Intrinsic Value Balance outstanding $ 10,577 $ 36,271 $ 36,271
Aggregate Intrinsic Value Exercisable   352 352
Aggregate Intrinsic Value Vested and Expected to vest   $ 36,271 $ 36,271
Weighted average grant-date fair value per share of stock options granted   $ 5.41 $ 4.85