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Collaboration, License and Success Payment Agreements - Schedule of Aggregate Potential Success Payments (Details) $ / shares in Units, $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($) $ / shares
Fred Hutch [Member] | 10x [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Multiple of initial equity value at issuance | 10
Share issued price per share | $ / shares | $ 18.29
Aggregate success payment | $ | $ 10
Fred Hutch [Member] | 20x [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Multiple of initial equity value at issuance | 20
Share issued price per share | $ / shares | $ 36.58
Aggregate success payment | $ | $ 40
Fred Hutch [Member] | 30x [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Multiple of initial equity value at issuance | 30
Share issued price per share | $ / shares | $ 54.86
Aggregate success payment | $ | $ 90
Fred Hutch [Member] | 40x [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Multiple of initial equity value at issuance | 40
Share issued price per share | $ / shares | $ 73.15
Aggregate success payment | $ | $ 140
Fred Hutch [Member] | 50x [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Multiple of initial equity value at issuance | 50
Share issued price per share | $ / shares | $ 91.44
Aggregate success payment | $ | $ 200
Stanford [Member] | 10x [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Multiple of initial equity value at issuance | 10
Share issued price per share | $ / shares | $ 18.29
Aggregate success payment | $ | $ 10
Stanford [Member] | 20x [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Multiple of initial equity value at issuance | 20
Share issued price per share | $ / shares | $ 36.58
Aggregate success payment | $ | $ 40
Stanford [Member] | 30x [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Multiple of initial equity value at issuance | 30
Share issued price per share | $ / shares | $ 54.86
Aggregate success payment | $ | $ 90
Stanford [Member] | 40x [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Multiple of initial equity value at issuance | 40
Share issued price per share | $ / shares | $ 73.15
Aggregate success payment | $ | $ 140
Stanford [Member] | 50x [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Multiple of initial equity value at issuance | 50
Share issued price per share | $ / shares | $ 91.44
Aggregate success payment | $ | $ 200

X
- Definition Aggregate success payment. + References No definition available. + Details
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Namespace Prefix: | lyel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Common stock price per share required for payment. + References No definition available. + Details
Name: | lyel_CommonStockPricePerShareRequiredForPayment
Namespace Prefix: | lyel_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Multiple of initial equity value at issuance. + References No definition available. + Details
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Namespace Prefix: | lyel_
Data Type: | xbrli:decimalItemType
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_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | lyel_EquityMultipleAxis=lyel_TenTimesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | lyel_EquityMultipleAxis=lyel_TwentyTimesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | lyel_EquityMultipleAxis=lyel_ThirtyTimesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | lyel_EquityMultipleAxis=lyel_FortyTimesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | lyel_EquityMultipleAxis=lyel_FiftyTimesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=lyel_LelandStanfordJuniorUniversityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |