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Property and Equipment - Summary of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Gross $ 7,153us-gaap_PropertyPlantAndEquipmentGross $ 9,094us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (5,192)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (5,403)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net 1,961us-gaap_PropertyPlantAndEquipmentNet 3,691us-gaap_PropertyPlantAndEquipmentNet
Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life 5 years  
Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life 3 years  
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Gross 906us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
906us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Estimated Useful Life Lease Term  
Laboratory and Research Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Gross 1,084us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
1,084us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Laboratory and Research Equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 5 years  
Useful Life 5 years  
Laboratory and Research Equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 3 years  
Useful Life 3 years  
Office Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Gross 1,969us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
2,023us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Office Furniture and Equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 5 years  
Useful Life 5 years  
Office Furniture and Equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 3 years  
Useful Life 3 years  
MelaFind Systems [Member]    
Property, Plant and Equipment [Line Items]    
Gross 3,194us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mela_MelaFindSystemsMember
5,081us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mela_MelaFindSystemsMember
Accumulated depreciation and amortization $ (726)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mela_MelaFindSystemsMember
 
Estimated Useful Life 3 years  
Useful Life 3 years