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Fair value of financial instruments - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
Fair Value Disclosures [Abstract] |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net | $ 0

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration