v3.19.3
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Oct. 25, 2019
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol NTLA  
Entity Registrant Name INTELLIA THERAPEUTICS, INC.  
Entity Central Index Key 0001652130  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   48,882,268
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity File Number 001-37766  
Entity Tax Identification Number 36-4785571  
Entity Address, Address Line One 40 Erie Street  
Entity Address, Address Line Two Suite 130  
Entity Address, City or Town Cambridge  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02139  
City Area Code 857  
Local Phone Number 285-6200  
Entity Incorporation, State or Country Code DE  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Security Exchange Name NASDAQ  
Document Quarterly Report true  
Document Transition Report false