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Net income (loss) per share - Reconciliation of Numerator and Denominator in Basic and Diluted Net Income (Loss) Per Common Share Computations (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Net income $ 9,672 $ 3,915 $ 1,248 $ 690 $ 21,480 $ 5,865 $ 3,970 $ 2,160 $ 15,525 $ 33,475 $ 5,313
Adjustments to numerator:                      
Dividend paid to preferred stockholders                 0 0 (66,531)
Accretion of convertible preferred stock to maximum redemption value                 0 0 (436,317)
Net income (loss) attributable to common stockholders                 $ 15,525 $ 33,475 $ (497,535)
Denominator:                      
Weighted average common shares outstanding - basic (in shares)                 46,828,798 45,358,452 12,606,529
Dilutive common equivalent shares from equity awards (in shares)                 2,439,818 4,016,306 0
Weighted average common shares outstanding - diluted (in shares)                 49,268,616 49,374,758 12,606,529
Net income (loss) per share:                      
Basic (in USD per share) $ 0.20 $ 0.08 $ 0.03 $ 0.01 $ 0.47 $ 0.13 $ 0.09 $ 0.05 $ 0.33 $ 0.74 $ (39.47)
Diluted (in USD per share) $ 0.20 $ 0.08 $ 0.03 $ 0.01 $ 0.44 $ 0.12 $ 0.08 $ 0.04 $ 0.32 $ 0.68 $ (39.47)
Anti-dilutive securities excluded from diluted EPS:                      
Anti-dilutive securities excluded from diluted EPS, Total (in shares)                 3,373,529 1,176,787 7,591,298