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OTHER CURRENT ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 1,827us-gaap_PrepaidExpenseCurrent $ 667us-gaap_PrepaidExpenseCurrent
Refundable research and development tax credits 809mrtx_RefundableResearchAndDevelopmentTaxCreditsCurrent 809mrtx_RefundableResearchAndDevelopmentTaxCreditsCurrent
Security deposits and other receivables 622us-gaap_OtherAssetsCurrent 506us-gaap_OtherAssetsCurrent
Interest receivables 96mrtx_InterestAndOtherReceivablesCurrent 163mrtx_InterestAndOtherReceivablesCurrent
Other current assets $ 3,354us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 2,145us-gaap_PrepaidExpenseAndOtherAssetsCurrent