Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Oct. 24, 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  
Title of 12(b) Security Common Shares, CHF 0.03 par value  
Trading Symbol CRSP  
Security Exchange Name NASDAQ  
Entity Registrant Name CRISPR THERAPEUTICS AG  
Entity Central Index Key 0001674416  
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   55,204,242
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 001-37923  
Entity Address, Address Line One Baarerstrasse 14  
Entity Address, City or Town Zug  
Entity Address, Country CH  
Entity Address, Postal Zip Code 6300  
City Area Code 41 (0)41  
Local Phone Number 561 32 77  
Entity Interactive Data Current Yes  
Entity Incorporation, State or Country Code V8  
Document Quarterly Report true  
Document Transition Report false