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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Deferred rent balance |  | $ 2.1 | $ 2.0
Rent expense |  | $ 1.2 | $ 0.6
Other Commitment | $ 5.8 |  |
MOLDOVA | Office and Laboratory Space |  |  |
Lease expiration year | 2030 | 2030 |
Lonza SOW [Member] |  |  |
Other Commitment |  | $ 24.5 |

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- Definition Lease expiration year. + References No definition available. + Details
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Namespace Prefix: | aclx_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating leases deferred rent. + References No definition available. + Details
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Namespace Prefix: | aclx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123406913&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_StatementGeographicalAxis=stpr_MD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=aclx_LonzaSowMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |