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Commitments and Contingencies (Future Lease Payments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
2015 $ 301us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 268us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 243us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 113us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 15ngs_OperatingLeasesFutureMinimumPaymentsDueAfterFourYears
Total $ 940us-gaap_OperatingLeasesFutureMinimumPaymentsDue