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Property and Equipment (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Gross Property and Equipment 239,698us-gaap_PropertyPlantAndEquipmentGross $ 260,636us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated Depreciation (239,698)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (260,636)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net Property and Equipment      
Lab equipment and instruments [Member]    
Property, Plant and Equipment [Line Items]    
Gross Property and Equipment 178,547us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= pmhs_LabEquipmentAndInstrumentsMember
194,143us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= pmhs_LabEquipmentAndInstrumentsMember
Lab equipment and instruments [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (years) 4 years  
Lab equipment and instruments [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (years) 6 years  
Computer equipment [Member]    
Property, Plant and Equipment [Line Items]    
Gross Property and Equipment 61,151us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
$ 66,493us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Computer equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (years) 4 years  
Computer equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (years) 6 years