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Summary of Significant Accounting Policies (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 691,847us-gaap_PropertyPlantAndEquipmentGross   $ 598,960us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization (359,341)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   (317,405)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 332,506us-gaap_PropertyPlantAndEquipmentNet   281,555us-gaap_PropertyPlantAndEquipmentNet
Number of major customers accounting for more than 10% of revenue 0smtp_NumberOfMajorCustomersAccountingForMoreThanTenPercentOfRevenue 0smtp_NumberOfMajorCustomersAccountingForMoreThanTenPercentOfRevenue  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 18,155us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
  18,154us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Leasehold improvements [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 3 years    
Leasehold improvements [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 5 years    
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 110,186us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
  84,377us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Furniture and fixtures [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 3 years    
Furniture and fixtures [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 5 years    
Computer equipment and software [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 563,506us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
  $ 496,429us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Estimated useful lives 3 years    
Software license [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 3 years    
Software license [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 5 years