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Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 598,960us-gaap_PropertyPlantAndEquipmentGross $ 472,603us-gaap_PropertyPlantAndEquipmentGross  
Less: Accumulated depreciation and amortization (317,405)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (145,261)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property and equipment, net 281,555us-gaap_PropertyPlantAndEquipmentNet 327,342us-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 18,154us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
16,245us-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 84,377us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
13,619us-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 496,429us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
427,286us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
 
Estimated useful lives 3 years    
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross    15,453us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
 
Software license [Member]      
Property, Plant and Equipment [Line Items]      
Payments to acquire software license classified as property and equipment     $ 100,000us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
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