Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 5)

v2.4.1.9
Stock-Based Compensation (Details 5) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Stock Options  
Stock-Based compensation  
Unrecognized stock-based compensation expense related to unvested stock options $ 5,780us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= env_EmployeeAndOtherStockOptionMember
Unrecognized compensation expense related to unvested stock options and restricted stock, weighted-average recognition period 2 years 6 months
Restricted stock with performance and subsequent service conditions  
Stock-Based compensation  
Unvested restricted stock, service condition 2 years
Restricted stock with performance and subsequent service conditions | 2012 Plan modification  
Stock-Based compensation  
Unrecognized stock-based compensation expense related to unvested stock options 2,038us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= env_RestrictedStockWithPerformanceConditionsAndSubsequentServiceConditionsMember
/ us-gaap_PlanNameAxis
= env_PlanModification2012Member
Unvested restricted stock, service condition 2 years
Service-based vesting | Restricted Stock  
Stock-Based compensation  
Unrecognized stock-based compensation expense related to unvested stock options $ 22,066us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ env_VestingCriteriaAxis
= env_VestingBasedOnServiceMember
Unrecognized compensation expense related to unvested stock options and restricted stock, weighted-average recognition period 2 years 6 months
Service-based vesting | Restricted stock with performance and subsequent service conditions | Maximum | 2012 Plan modification  
Stock-Based compensation  
Unrecognized compensation expense related to unvested stock options and restricted stock, weighted-average recognition period 2 years
Third Year Performance Condition Achieved Member | Restricted Stock | 2012 Plan modification  
Stock-Based compensation  
Vested (in shares) 87,381env_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= env_PlanModification2012Member
/ env_VestingCriteriaAxis
= env_ThirdYearPerformanceConditionAchievedMember