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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

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