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Share-based compensation - Return target options activity (Details) - Performance-based options $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Options (in shares)
Outstanding Beginning Balance | shares	3,687,664
Outstanding Ending Balance | shares	3,687,664	3,687,664
Weighted Average Exercise Price
Outstanding Beginning Balance | $ / shares	$ 6.75
Outstanding Ending Balance | $ / shares	$ 6.75	$ 6.75
Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value
Remaining term, options outstanding	8 years	8 years 9 months 18 days
Aggregate intrinsic value, options outstanding, beginning	$ 29,908
Aggregate intrinsic value, options outstanding, ending	113,786	$ 29,908
Unrecognized compensation expense
Unrecognized compensation expense	$ 33,000

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Amount of cost to be recognized for option under share-based payment arrangement.

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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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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