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Stock-based compensation - Summary of Service-based Stock Option Activity and Related Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Options outstanding
Options outstanding, Exercisable (in shares) | shares	1,068,482
Weighted-average exercise price
Weighted-average exercise price, Exercisable (in USD per share)	$ 2.00
Weighted-average remaining contractual life (in years), Exercisable	5 years 8 months 12 days
Aggregate intrinsic values, Exercisable | $	$ 7,120
Closing stock price (in USD per share)	$ 8.66
Service-based Stock Options
Options outstanding
Beginning balance (in shares) | shares	2,597,294
Granted (in shares) | shares	585,250
Exercised (in shares) | shares	(236,490)
Canceled or forfeited (in shares) | shares	(199,384)
Ending balance (in shares) | shares	2,746,670
Options outstanding, Exercisable (in shares) | shares	1,399,451
Weighted-average exercise price
Beginning balance (in USD per share)	$ 10.66
Granted (in USD per share)	18.43
Exercised (in USD per share)	3.75
Canceled or forfeited (in USD per share)	10.56
Ending balance (in USD per share)	12.91
Weighted-average exercise price, Exercisable (in USD per share)	$ 9.14
Weighted-average remaining contractual life (in years), Outstanding	7 years 7 months 6 days
Weighted-average remaining contractual life (in years), Exercisable	6 years 10 months 24 days
Aggregate intrinsic values, Outstanding | $	$ 4,880
Aggregate intrinsic values, Exercisable | $	$ 4,200

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Number of share options (or share units) exercised during the current period.

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