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Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Federal tax provision at statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes (net of Federal benefit) 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 10.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Orphan drug credit     0.30%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther
Stock-based compensation 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Non-deductible officer compensation 0.10%mdvn_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficersCompensation (1.80%)mdvn_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficersCompensation (1.90%)mdvn_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficersCompensation
Change in valuation allowance (40.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (52.10%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (45.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Research and development credits (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch 17.10%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch  
Other 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate (6.20%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (0.30%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations