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Commitments - Additional Information (Details) - Lonza $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)
Related Party Transaction [Line Items]
Prior notification period to terminate arrangement		12 months
Minimum non-cancellable costs	$ 38.9	$ 38.9
Payments for non-cancellable costs	$ 2.8	$ 10.9

X

- Definition

Minimum non-cancellable costs.

+ References

No definition available.

+ Details

Name:	aclx_MinimumNonCancellableCosts
Namespace Prefix:	aclx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Payments for non-cancellable costs.

+ References

No definition available.

+ Details

Name:	aclx_PaymentsForNonCancellableCosts
Namespace Prefix:	aclx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Prior notification period to terminate arrangement.

+ References

No definition available.

+ Details

Name:	aclx_PriorNotificationPeriodToTerminateArrangement
Namespace Prefix:	aclx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=aclx_LonzaHoustonIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: