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Other current assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 1,544us-gaap_PrepaidExpenseCurrent $ 1,827us-gaap_PrepaidExpenseCurrent
Refundable research and development tax credits 809mrtx_RefundableResearchAndDevelopmentTaxCreditsCurrent 809mrtx_RefundableResearchAndDevelopmentTaxCreditsCurrent
Security deposits and other receivables 530mrtx_SecurityDepositsAndOtherReceivables 622mrtx_SecurityDepositsAndOtherReceivables
Interest receivables 283us-gaap_InterestReceivableCurrent 96us-gaap_InterestReceivableCurrent
Other current assets $ 3,166us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 3,354us-gaap_PrepaidExpenseAndOtherAssetsCurrent