Document and Entity Information	3 Months Ended
	Mar. 31, 2015	May 05, 2015
Document and Entity Information
Entity Registrant Name	Mirati Therapeutics, Inc.
Entity Central Index Key	0001576263
Document Type	10-Q
Document Period End Date	Mar. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		16,182,927
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1