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Segment Information and Information about Geographic Areas (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
item
Mar. 31, 2014
Segment Information and Information about Geographic Areas    
Number of business segment 1us-gaap_NumberOfOperatingSegments  
Revenue and long-lived assets by geographic area    
Revenue $ 46,000us-gaap_SalesRevenueServicesNet $ 32,292us-gaap_SalesRevenueServicesNet
Long-lived assets 17,672us-gaap_NoncurrentAssets 16,832us-gaap_NoncurrentAssets
United States    
Revenue and long-lived assets by geographic area    
Revenue 39,265us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= country_US		 27,350us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= country_US
Long-lived assets 17,074us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US		 16,265us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
EMEA    
Revenue and long-lived assets by geographic area    
Revenue 3,152us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember		 2,656us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
Long-lived assets 232us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember		 209us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
Other    
Revenue and long-lived assets by geographic area    
Revenue 3,583us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= mkto_OtherCountriesMember		 2,286us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= mkto_OtherCountriesMember
Long-lived assets $ 366us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= mkto_OtherCountriesMember		 $ 358us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= mkto_OtherCountriesMember