Annual report pursuant to Section 13 and 15(d)

Other Non-Current Assets (Details)

v2.4.1.9
Other Non-Current Assets (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Other Non-Current Assets.    
Investment in private company $ 1,250us-gaap_CostMethodInvestments $ 1,250us-gaap_CostMethodInvestments
Deposits:    
Lease 1,811us-gaap_SecurityDeposit 1,751us-gaap_SecurityDeposit
Other 436us-gaap_DepositsAssetsNoncurrent 286us-gaap_DepositsAssetsNoncurrent
Unamortized convertible debt issuance costs 4,612us-gaap_DebtInstrumentUnamortizedDiscount  
Other 1,407us-gaap_OtherAssetsMiscellaneousNoncurrent 1,642us-gaap_OtherAssetsMiscellaneousNoncurrent
Total other non-current assets $ 9,516us-gaap_OtherAssetsNoncurrent $ 4,929us-gaap_OtherAssetsNoncurrent
Number of Preferred A Units owned 1,250,000env_NumberOfPreferredUnitsPurchased  
Cumulative interest rate (as a percent) 8.00%us-gaap_PreferredStockDividendRatePercentage