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Warrants (Summary of Warrants Activity) (Details) (Warrant [Member], USD $)
1 Months Ended 3 Months Ended
Jan. 31, 2015
Mar. 31, 2015
Warrant [Member]
   
Warrant activity, number of shares:    
Outstanding, beginning of period 200,973us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
200,973us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Granted     
Cancelled (30,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
(30,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Outstanding, end of period   170,973us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Exercisable   170,973smtp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisable
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Warrant activity, weighted average exercise price:    
Outstanding, beginning of period $ 6.07smtp_ShareBasedCompensationArrangementByShareBasedPaymentAwardInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
$ 6.07smtp_ShareBasedCompensationArrangementByShareBasedPaymentAwardInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Granted     
Cancelled   $ 5.00smtp_ShareBasedCompensationArrangementByShareBasedPaymentAwardInstrumentsOtherThanOptionsExpiredInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Outstanding, end of period   $ 6.26smtp_ShareBasedCompensationArrangementByShareBasedPaymentAwardInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Exercisable   $ 6.26smtp_ShareBasedCompensationArrangementByShareBasedPaymentAwardInstrumentsOtherThanOptionsOutstandingExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Outstanding, remaining contractual term   3 years 7 months 6 days
Outstanding, intrinsic value     
Exercisable, weighted average remaining contractual term   3 years 7 months 6 days
Exercisable, intrinsic value