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Stock-Based Compensation - Restricted Stock and Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted Average Grant Date Fair Value
Compensation expense	$ 23,156	$ 27,243
Restricted Stock
Changes in unvested restricted stock
Unvested restricted shares, beginning of period (in shares)	581,408
Issued (in shares)	364,549
Vested (in shares)	(304,638)
Forfeited (in shares)	(133,869)
Unvested restricted shares, end of period(in shares)	507,450	581,408
Weighted Average Grant Date Fair Value
Balance, beginning of period	$ 24.03
Issued (in dollars per share)	29.57
Vested (in dollars per share)	23.37
Forfeited (in dollars per share)	24.72
Balance, ending of period	$ 27.35	$ 24.03
Unrecognized stock-based compensation expense	$ 11,900
Period for recognition	2 years 8 months 12 days
Restricted Stock | Employees
Weighted Average Grant Date Fair Value
Compensation expense	$ 2,800	$ 4,700	$ 0
Restricted Stock | Non-employees
Weighted Average Grant Date Fair Value
Compensation expense	1,600	$ 1,600	2,400
Stock options
Weighted Average Grant Date Fair Value
Unrecognized stock-based compensation expense	$ 40,400
Period for recognition	2 years 8 months 12 days
Changes in unvested stock options
Outstanding, beginning of period (in shares)	4,358,291
Granted (in shares)	1,721,748
Exercised (in shares)	(964,412)
Cancelled (in shares)	(1,203,370)
Outstanding, end of period (in shares)	3,912,257	4,358,291
Exercisable (in shares)	1,463,668
Outstanding, beginning of period (in dollars per share)	$ 25.40
Granted (in dollars per share)	30.44
Exercised (in dollars per share)	20.22
Cancelled (in dollars per share)	30.72
Outstanding, end of period (in dollars per share)	27.26	$ 25.40
Exercisable (in dollar per share)	$ 24.05
Remaining contractual life	7 years 10 months 24 days	7 years 4 months 24 days
Exercisable, remaining contractual life	6 years 9 months 18 days
Aggregate intrinsic value	$ 167,640	$ 26,060
Exercisable, aggregated intrinsic value	67,413
Employee and Consultant Options
Changes in unvested stock options
Intrinsic value of options exercised	$ 15,600	$ 14,600	$ 15,900
Weighted average fair value of options granted (per share)	$ 16.60	$ 15.67	$ 24.91
Employee and Consultant Options | Employees and directors
Weighted Average Grant Date Fair Value
Compensation expense	$ 16,100	$ 18,100	$ 19,900

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Name:	srt_TitleOfIndividualAxis=edit_EmployeeAndDirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: