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Long-Term Debt - Future Principal Payments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Debt Disclosure [Abstract]  
2015 (remaining six months ending June 30, 2015) $ 2,350us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
2016 4,700us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017 4,700us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018 4,700us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019 12,025us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Long-term debt, gross $ 28,475us-gaap_DebtLongtermAndShorttermCombinedAmount