Document and Entity Information
Nov. 28, 2022
Document and Entity Information [Abstract]  
Document Type 8-K
Document Period End Date Nov. 28, 2022
Entity File Number 001-38150
Entity Registrant Name Kala Pharmaceuticals, Inc.
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 27-0604595
Entity Address, Address Line One 1167 Massachusetts Avenue
Entity Address, City or Town Arlington
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02476
City Area Code 781
Local Phone Number 996-5252
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.001 par value per share
Trading Symbol KALA
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period true
Entity Central Index Key 0001479419
Amendment Flag false
Current Fiscal Year End Date --12-31