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Inventory - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Aug. 06, 2014
Dec. 31, 2013
Inventory [Line Items]      
Inventory, Gross $ 6,684us-gaap_InventoryGross   $ 5,956us-gaap_InventoryGross
Reserve for inventory 539us-gaap_InventoryValuationReserves    
Mela Find Systems [Member]      
Inventory [Line Items]      
Inventory, Gross 3,268us-gaap_InventoryGross
/ us-gaap_PublicUtilitiesInventoryAxis
= mela_MelaFindSystemsMember		   5,402us-gaap_InventoryGross
/ us-gaap_PublicUtilitiesInventoryAxis
= mela_MelaFindSystemsMember
Hand Held Imager Assemblies [Member]      
Inventory [Line Items]      
Inventory, Gross 350us-gaap_InventoryGross
/ us-gaap_PublicUtilitiesInventoryAxis
= mela_HandHeldImagerAssembliesMember		   0us-gaap_InventoryGross
/ us-gaap_PublicUtilitiesInventoryAxis
= mela_HandHeldImagerAssembliesMember
Settlement amount   1,143mela_SettlementAmountPaid
/ us-gaap_PublicUtilitiesInventoryAxis
= mela_HandHeldImagerAssembliesMember		  
Inventory Repairs [Member]      
Inventory [Line Items]      
Reserve for inventory $ 539us-gaap_InventoryValuationReserves
/ us-gaap_PublicUtilitiesInventoryAxis
= mela_InventoryRepairsMember		   $ 0us-gaap_InventoryValuationReserves
/ us-gaap_PublicUtilitiesInventoryAxis
= mela_InventoryRepairsMember