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Stock-based compensation - Summary of Performance-based and Market-based Stock Option Activity and Related Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Weighted-average exercise price
Options outstanding, Exercisable (in shares) | shares	1,068,482
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
Performance-based and Market-based Stock Options
Options outstanding
Beginning balance (in shares) | shares	2,406,537
Exercised (in shares) | shares	(901,505)
Canceled or forfeited (in shares) | shares	(22,250)
Ending balance (in shares) | shares	1,482,782
Weighted-average exercise price
Beginning balance (in USD per share)	$ 6.58
Exercised (in USD per share)	2.54
Canceled or forfeited (in USD per share)	12.95
Ending balance (in USD per share)	$ 8.94
Weighted-average remaining contractual life (in years), Outstanding	6 years 3 months 18 days
Aggregate intrinsic values, Outstanding | $	$ 7,120

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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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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 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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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