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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: