Commitments and contingencies - Collaboration receivables and contract liabilities - (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)
Commitments and contingencies
Related party collaboration receivable, beginning balance	$ 18,496
Additions	35,952
Deductions	(46,436)
Related party collaboration receivable, ending balance	8,012
Deferred revenue, beginning balance	70,040
Deductions	(26,351)
Deferred revenue, ending balance	$ 43,689

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of increase to contract with customer assets during the reporting period.

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Amount of decrease to contract with customer assets during the reporting period.

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