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Stockholders' Equity Stockholders' Equity (Details) (USD $)
Feb. 17, 2015
Class of Warrant or Right [Line Items]  
Investor, Ownership Percentage in Company Stock 50.00%metr_InvestorOwnershipPercentageinCompanyStock
Flip-in Date [Member]  
Class of Warrant or Right [Line Items]  
Class of Warrant or Right, Exercise Price of Warrants or Rights 100.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_AwardDateAxis
= metr_FlipinDateMember
Flip-in Date [Member] | Minimum [Member]  
Class of Warrant or Right [Line Items]  
Investor, Ownership Percentage in Company Stock 15.00%metr_InvestorOwnershipPercentageinCompanyStock
/ us-gaap_AwardDateAxis
= metr_FlipinDateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Flip-in Date [Member] | Maximum [Member]  
Class of Warrant or Right [Line Items]  
Investor, Ownership Percentage in Company Stock 50.00%metr_InvestorOwnershipPercentageinCompanyStock
/ us-gaap_AwardDateAxis
= metr_FlipinDateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Director [Member] | Prior to Flip-in Date [Member]  
Class of Warrant or Right [Line Items]  
Class of Warrant or Right, Exercise Price of Warrants or Rights 0.001us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_AwardDateAxis
= metr_PriortoFlipinDateMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember