Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v2.4.1.9
Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of Significant Accounting Policies      
Estimated period of customer relationship 5 years    
Changes in allowance for doubtful accounts      
Balance, beginning of year $ 203us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent    
Add: Provisions for doubtful accounts 15us-gaap_ProvisionForDoubtfulAccounts 203us-gaap_ProvisionForDoubtfulAccounts  
Less: Write-offs (142)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs    
Balance, end of year 76us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 203us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent  
Impairments to investments 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment 47us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Impairments of internally developed software 0us-gaap_CapitalizedComputerSoftwareImpairments 0us-gaap_CapitalizedComputerSoftwareImpairments 0us-gaap_CapitalizedComputerSoftwareImpairments
Impairment charges 0us-gaap_GoodwillAndIntangibleAssetImpairment 0us-gaap_GoodwillAndIntangibleAssetImpairment 0us-gaap_GoodwillAndIntangibleAssetImpairment
Impairments to long-lived assets 0env_ImpairmentOfLongLivedAssetsHeldForUseExcludingInvestmentImpairments 283env_ImpairmentOfLongLivedAssetsHeldForUseExcludingInvestmentImpairments 0env_ImpairmentOfLongLivedAssetsHeldForUseExcludingInvestmentImpairments
Advertising costs 675us-gaap_AdvertisingExpense 1,028us-gaap_AdvertisingExpense 1,504us-gaap_AdvertisingExpense
Technology development expenses 8,178us-gaap_TechnologyServicesCosts 5,998us-gaap_TechnologyServicesCosts 6,309us-gaap_TechnologyServicesCosts
India      
Long-Lived Assets      
Long-lived assets $ 1,503us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_IN
$ 997us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_IN