401(k) Plan	12 Months Ended
Dec. 31, 2018
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]
401(k) Plan	12. 401(k) Plan In 2015, the Company established the Intellia Therapeutics, Inc. 401(k) Plan (the “401(k) Plan”) for its employees, which is designed to be qualified under Section 401(k) of the Internal Revenue Code. Eligible employees are permitted to contribute to the 401(k) Plan within statutory and 401(k) Plan limits. During 2018, the Company began to make matching contributions of 50 percent of the first 6 percent of employee contributions. The Company made matching contributions of $0.6 million for the year ended December 31, 2018.

401(k) Plan

12 Months Ended

Dec. 31, 2018

Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]

12. 401(k) Plan

In 2015, the Company established the Intellia Therapeutics, Inc. 401(k) Plan (the “401(k) Plan”) for its employees, which is designed to be qualified under Section 401(k) of the Internal Revenue Code. Eligible employees are permitted to contribute to the 401(k) Plan within statutory and 401(k) Plan limits. During 2018, the Company began to make matching contributions of 50 percent of the first 6 percent of employee contributions. The Company made matching contributions of $0.6 million for the year ended December 31, 2018.