v3.21.2

Cover	Oct. 19, 2021
Cover [Abstract]
Document Type	8-K
Amendment Flag	false
Document Period End Date	Oct. 19, 2021
Entity File Number	001-36596
Entity Registrant Name	TRILLIUM THERAPEUTICS INC.
Entity Central Index Key	0001616212
Entity Tax Identification Number	00-0000000
Entity Incorporation, State or Country Code	A1
Entity Address, Address Line One	100 CambridgePark Drive
Entity Address, Address Line Two	Suite 510
Entity Address, City or Town	Cambridge
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02140
City Area Code	416
Local Phone Number	595-0627
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Common Shares, no par value per share
Trading Symbol	TRIL
Security Exchange Name	NASDAQ
Entity Emerging Growth Company	false

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Cover page.

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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

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Trillium Therapeutics Inc. 8-K