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Debt - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Jul. 21, 2014
Sep. 10, 2013
Oct. 22, 2014
Dec. 31, 2014
Dec. 31, 2013
Mar. 15, 2013
Jul. 24, 2014
Oct. 31, 2013
Oct. 29, 2013
Feb. 05, 2014
Debt Instrument [Line Items]                    
Preferred Stock, Par or Stated Value Per Share       $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare          
Proceeds from Issuance of Debt $ 15,000us-gaap_ProceedsFromIssuanceOfDebt                  
Common Stock, Par or Stated Value Per Share       $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare          
Debt Conversion, Converted Instrument, Shares Issued 5,847,955us-gaap_DebtConversionConvertedInstrumentSharesIssued1   619,490us-gaap_DebtConversionConvertedInstrumentSharesIssued1              
Convertible Preferred Stock Initial Conversion Price $ 2.565mela_ConvertiblePreferredStockInitialConversionPrice                  
Fair Value of Warrant Obligation 5,296mela_FairValueOfWarrantObligation         563mela_FairValueOfWarrantObligation        
Debt Instrument, Convertible, Beneficial Conversion Feature 4,566us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature     4,565us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature 0us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature          
Fair Value of Warrants Issued 491mela_FairValueOfWarrantsIssued                  
Senior Notes, Noncurrent 4,647us-gaap_SeniorLongTermNotes                  
Debt Instrument, Unamortized Discount       8,410us-gaap_DebtInstrumentUnamortizedDiscount            
Fair Value Assumptions, Expected Volatility Rate         93.43%us-gaap_FairValueAssumptionsExpectedVolatilityRate          
Fair Value Assumptions, Expected Term         5 years 3 months 29 days          
Fair Value Assumptions, Exercise Price       $ 1.20us-gaap_FairValueAssumptionsExercisePrice $ 6.40us-gaap_FairValueAssumptionsExercisePrice          
Fair Value Assumptions, Risk Free Interest Rate       1.65%us-gaap_FairValueAssumptionsRiskFreeInterestRate 1.75%us-gaap_FairValueAssumptionsRiskFreeInterestRate          
Aggregate Consideration Receivable For Warrants To Be Issued               685,715mela_AggregateConsiderationReceivableForWarrantsToBeIssued    
Long-term Debt, Gross           5,300us-gaap_DebtInstrumentCarryingAmount        
Fair Value Adjustment of Warrants       2,784us-gaap_FairValueAdjustmentOfWarrants 206us-gaap_FairValueAdjustmentOfWarrants          
Gains (Losses) on Extinguishment of Debt   983us-gaap_GainsLossesOnExtinguishmentOfDebt                
Debt Conversion, Converted Instrument, Amount     1,589us-gaap_DebtConversionConvertedInstrumentAmount1   652us-gaap_DebtConversionConvertedInstrumentAmount1          
Interest Expense, Debt     1,200us-gaap_InterestExpenseDebt              
Maximum [Member]                    
Debt Instrument [Line Items]                    
Fair Value Assumptions, Expected Volatility Rate       88.10%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Fair Value Assumptions, Expected Term       4 years 3 months 29 days            
Minimum [Member]                    
Debt Instrument [Line Items]                    
Fair Value Assumptions, Expected Volatility Rate       72.90%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Fair Value Assumptions, Expected Term       4 years 1 month 6 days            
Option Pricing Model [Member]                    
Debt Instrument [Line Items]                    
Share Price       $ 2.44us-gaap_SharePrice
/ us-gaap_ValuationTechniqueAxis
= mela_OptionPricingModelMember		            
Fair Value Assumptions, Expected Volatility Rate       93.46%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ValuationTechniqueAxis
= mela_OptionPricingModelMember		            
Fair Value Assumptions, Expected Term       5 years            
Fair Value Assumptions, Exercise Price       $ 2.45us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_ValuationTechniqueAxis
= mela_OptionPricingModelMember		            
Fair Value Assumptions, Risk Free Interest Rate       1.62%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ValuationTechniqueAxis
= mela_OptionPricingModelMember		            
Hercules Technology Growth Capital Inc [Member]                    
Debt Instrument [Line Items]                    
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 11.18us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_CounterpartyNameAxis
= mela_HerculesTechnologyGrowthCapitalIncMember		        
Debt Instrument, Interest Rate, Stated Percentage           10.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CounterpartyNameAxis
= mela_HerculesTechnologyGrowthCapitalIncMember		        
Debt and Capital Lease Obligations           6,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_CounterpartyNameAxis
= mela_HerculesTechnologyGrowthCapitalIncMember		        
Borrowed Funds Maturity Period           42 months        
Debt Instrument Period of Initial Interest Payment           first 12 months        
Prepayment of Loan   6,400mela_PrepaymentOfLoan
/ us-gaap_CounterpartyNameAxis
= mela_HerculesTechnologyGrowthCapitalIncMember		                
Debt Instrument, Fee Amount   425us-gaap_DebtInstrumentFeeAmount
/ us-gaap_CounterpartyNameAxis
= mela_HerculesTechnologyGrowthCapitalIncMember		                
Aggregate Consideration Receivable For Warrants To Be Issued           69,321mela_AggregateConsiderationReceivableForWarrantsToBeIssued
/ us-gaap_CounterpartyNameAxis
= mela_HerculesTechnologyGrowthCapitalIncMember		        
Investment Warrants Expiration Date           Apr. 26, 2018        
Series A Warrants [Member]                    
Debt Instrument [Line Items]                    
Warrants Issued to Purchase Common Stock, Shares 6,198,832mela_WarrantsIssuedToPurchaseCommonStockShares
/ us-gaap_ClassOfWarrantOrRightAxis
= mela_SeriesWarrantsMember		                  
Common Stock, Par or Stated Value Per Share $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_ClassOfWarrantOrRightAxis
= mela_SeriesWarrantsMember		                  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 2.45us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= mela_SeriesWarrantsMember		               $ 8.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= mela_SeriesWarrantsMember		  
Investment Warrants Expiration Month and Year 2019-07                  
Aggregate Consideration Receivable For Warrants To Be Issued                 685,715mela_AggregateConsiderationReceivableForWarrantsToBeIssued
/ us-gaap_ClassOfWarrantOrRightAxis
= mela_SeriesWarrantsMember		  
Series B Warrants [Member]                    
Debt Instrument [Line Items]                    
Warrants Issued to Purchase Common Stock, Shares             4,795,321mela_WarrantsIssuedToPurchaseCommonStockShares
/ us-gaap_ClassOfWarrantOrRightAxis
= mela_SeriesBWarrantsMember		      
Class of Warrant or Right, Exercise Price of Warrants or Rights             $ 2.45us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= mela_SeriesBWarrantsMember		      
Investment Warrants Expiration Month and Year             2016-01      
Series B Preferred Stock [Member]                    
Debt Instrument [Line Items]                    
Stock Issued During Period, Shares, New Issues       12,300,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 0us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		          
Preferred Stock, Par or Stated Value Per Share                   $ 1,000.00us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Preferred Stock Stated Value Per Share                   $ 0.10mela_PreferredStockStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Investment Warrants Expiration Month and Year 2019-07                  
Debt Conversion, Converted Instrument, Amount         0us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		          
Debentures [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage       4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mela_DebenturesMember		            
Debt Instrument, Unamortized Discount 10,353us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= mela_DebenturesMember		                  
Warrant Obligation [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Unamortized Discount       727us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= mela_WarrantObligationMember		            
Fair Value Assumptions, Expected Volatility Rate       77.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_DebtInstrumentAxis
= mela_WarrantObligationMember		            
Fair Value Assumptions, Expected Term       5 years            
Fair Value Assumptions, Risk Free Interest Rate       0.84%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_DebtInstrumentAxis
= mela_WarrantObligationMember		            
Fair Value Adjustment of Warrants       $ 90us-gaap_FairValueAdjustmentOfWarrants
/ us-gaap_DebtInstrumentAxis
= mela_WarrantObligationMember		            
Percentage of Change in Unobservable Input       10.00%mela_PercentageOfChangeInUnobservableInput
/ us-gaap_DebtInstrumentAxis
= mela_WarrantObligationMember		            
Warrant Obligation [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Share Price       $ 11.80us-gaap_SharePrice
/ us-gaap_DebtInstrumentAxis
= mela_WarrantObligationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Fair Value Assumptions, Exercise Price       $ 11.60us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_DebtInstrumentAxis
= mela_WarrantObligationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Warrant Obligation [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Share Price       $ 11.60us-gaap_SharePrice
/ us-gaap_DebtInstrumentAxis
= mela_WarrantObligationMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Fair Value Assumptions, Exercise Price       $ 11.50us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_DebtInstrumentAxis
= mela_WarrantObligationMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember