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Accrued expenses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accrued Expenses [Line Items]    
Professional fees $ 100us-gaap_AccruedProfessionalFeesCurrent $ 66us-gaap_AccruedProfessionalFeesCurrent
Non-executive directors’ fees 56mgt_AccruedDirectorsFeesCurrent 23mgt_AccruedDirectorsFeesCurrent
Other 24us-gaap_OtherAccruedLiabilitiesCurrent 5us-gaap_OtherAccruedLiabilitiesCurrent
Total $ 180us-gaap_AccruedLiabilitiesCurrent $ 94us-gaap_AccruedLiabilitiesCurrent