Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Share-based compensation - RSU activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
2014 Plan
Other disclosure
Vesting period (in years)	4 years
2014 Plan \| Non-executive directors
Other disclosure
Vesting period (in years)	1 year
Restricted share units ("RSUs")
Number of shares
Non-vested at beginning of period (in shares)	710,617
Granted (in shares)	1,604,533
Vested (in shares)	(292,688)
Forfeited (in shares)	(203,688)
Non-vested at end of period (in shares)	1,818,774	710,617
Weighted average grant-date fair value
Non-vested at beginning of period (in dollars per share)	$ 38.89
Granted (in dollars per share)	16.10
Vested (in dollars per share)	39.31
Forfeited (in dollars per share)	23.39
Non-vested at end of period (in dollars per share)	$ 20.46	$ 38.89
Other disclosure
Total weighted average grant date fair value of RSUs granted during the period (in millions)	$ 25,800
Restricted share units ("RSUs") \| Non-executive directors
Other disclosure
Vesting period (in years)	1 year
Restricted share units ("RSUs") \| Directors and Officers
Number of shares
Granted (in shares)	380,288
Weighted average grant-date fair value
Granted (in dollars per share)	$ 6.0
Restricted share units ("RSUs") \| 2014 Plan
Number of shares
Granted (in shares)	1,604,533	574,921	376,799
Weighted average grant-date fair value
Granted (in dollars per share)	$ 16.10	$ 36.14	$ 48.18
Other disclosure
Total weighted average grant date fair value of RSUs granted during the period (in millions)	$ 5,104	$ 8,063	$ 12,156
Share options \| 2014 Plan
Weighted average grant-date fair value
Granted (in dollars per share)	$ 9.04	$ 20.95	$ 28.08
Vested (in dollars per share)	$ 22.27
Minimum \| Restricted share units ("RSUs")
Other disclosure
Vesting period (in years)	1 year
Maximum \| Restricted share units ("RSUs")
Other disclosure
Vesting period (in years)	3 years