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Commitments and Contingencies - Licensor Expense Reimbursement (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Licensor Expense Reimbursement |  |  |  |
Commitments and contingencies |  |  |  |
Payments for licensor expense reimbursement | $ 2.9 | $ 5.1 | $ 11.0 | $ 13.0

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- Definition Payments for professional fees. + References No definition available. + Details
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Namespace Prefix: | edit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OtherCommitmentsAxis=edit_CommitmentToReimburseLicensorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |