Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants - Warrants by Exercise Price (Details)

v2.4.1.9
Stock Options and Warrants - Warrants by Exercise Price (Details) (Row 44 Warrants, USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Common stock warrants
  
Share-based Compensation, Shares Authorized under Equity Instruments Other Than Options, Exercise Price Range [Line Items]  
Weighted Average Exercise Price per Warrant (usd per share) $ 8.79ent_SharebasedCompensationSharesAuthorizedunderEquityInstrumentsOtherThanOptionsExercisePricePerWarrantasConverted
/ us-gaap_ClassOfWarrantOrRightAxis
= ent_CommonStockWarrantsMember
/ us-gaap_PlanNameAxis
= ent_Row44WarrantsMember
Number of Warrants (as converted) 690ent_SharebasedCompensationSharesAuthorizedunderEquityInstrumentsOtherThanOptionsExercisePriceRangeNumberOutstandingasConverted
/ us-gaap_ClassOfWarrantOrRightAxis
= ent_CommonStockWarrantsMember
/ us-gaap_PlanNameAxis
= ent_Row44WarrantsMember
Weighted Average Remaining Life (in years) 1 year 11 months 18 days
Series C-2 Warrants
  
Share-based Compensation, Shares Authorized under Equity Instruments Other Than Options, Exercise Price Range [Line Items]  
Weighted Average Exercise Price per Warrant (usd per share) $ 8.74ent_SharebasedCompensationSharesAuthorizedunderEquityInstrumentsOtherThanOptionsExercisePricePerWarrantasConverted
/ us-gaap_ClassOfWarrantOrRightAxis
= ent_SeriesC2WarrantsMember
/ us-gaap_PlanNameAxis
= ent_Row44WarrantsMember
Number of Warrants (as converted) 734ent_SharebasedCompensationSharesAuthorizedunderEquityInstrumentsOtherThanOptionsExercisePriceRangeNumberOutstandingasConverted
/ us-gaap_ClassOfWarrantOrRightAxis
= ent_SeriesC2WarrantsMember
/ us-gaap_PlanNameAxis
= ent_Row44WarrantsMember
Weighted Average Remaining Life (in years) 2 years 2 months 8 days