Commitments and contingencies - Collaboration receivables and contract liabilities - (Details) $ in Thousands	6 Months Ended
Jun. 30, 2022 USD ($)
Commitments and contingencies
Related party collaboration receivables, beginning balance	$ 732
Additions	358
Deductions	(939)
Related party collaboration receivables, ending balance	151
Deferred revenue, beginning balance	12,096
Deductions	(1,214)
Deferred revenue, ending balance	$ 10,881

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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.

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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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